Improve harvest error reporting

[LukasKalbertodt]

Previously, when an item failed to deserialize, we logged this:

WARN  tobira::sync::harvest >  Could not deserialize item in harvest response for kind 'event' (updated 2024-10-02 09:01:49.038 UTC)

This always required, manually finding the item with said updated time, then writing some code to actually find out whats wrong.

With this PR, Tobira will log an actual useful error and the whole raw value. See this (I added dummy required field title2 to cause an error):

ERROR tobira::sync::harvest >  Could not deserialize 'event' harvest item -> ignoring. Error: missing field `title2`
DEBUG tobira::sync::harvest >  Raw value: {
                            >    "acl": {
                            >      "read": [
                            >        "ROLE_ANONYMOUS"
                            >      ]
                            >    },
                            >    "captions": [],
                            >    "created": 1460505600000,
                            >    "creators": [
                            >      "Dissertori,  Günther"
                            >    ],
                            >    "description": null,
                            >    "duration": 5637803,
                            >    "endTime": 1460543400000,
                            >    "id": "09828f52-b684-32b3-a614-cbb96fc63ee8",
                            >    "isLive": false,
                            >    "kind": "event",
                            >    "metadata": {
                            >      "dcterms": {
                            >        "contributor": [
                            >          "D-PHYS"
                            >        ],
                            >        "issued": [
                            >          "2016-04-14"
                            >        ],
                            >        "language": [
                            >          "deu"
                            >        ],
                            >        "license": [
                            >          "CC-BY-NC-ND"
                            >        ],
                            >        "publisher": [
                            >          "ETH Zürich, ID-MMS; Schweiz"
                            >        ],
                            >        "rightsHolder": [
                            >          "ETH Zürich, Schweiz"
                            >        ],
                            >        "spatial": [
                            >          "Zürich, Schweiz; ETH Zürich, HPV G 5"
                            >        ],
                            >        "temporal": [
                            >          "start=2016-04-13T08:45:00Z; end=2016-04-13T10:30:00Z; scheme=W3C-DTF;"
                            >        ],
                            >        "type": [
                            >          "MovingImage"
                            >        ]
                            >      },
                            >      "http://ethz.ch/video/metadata": {
                            >        "owner": [
                            >          "Dissertori, Günther"
                            >        ]
                            >      }
                            >    },
                            >    "partOf": "97eea518-409b-372b-b47a-54483658fc0c",
                            >    "segments": [],
                            >    "slideText": null,
                            >    "startTime": 1460537100000,
                            >    "thumbnail": "https://tobira-test-oc.ethz.ch/static/mh_default_org/engage-player/09828f52-b684-32b3-a614-cbb96fc63ee8/0579ed69-56f2-4d4d-878d-d85210e8df30/presentation_0dd34669_9a79_4a1b_be52_216ba65f4688_3_000s_player_preview_16_9_all_to_16_9_640x360.jpg",
                            >    "timelinePreview": null,
                            >    "title": "Einführung in die Kern- und Teilchenphysik",
                            >    "tracks": [
                            >      {
                            >        "flavor": "presentation/delivery",
                            >        "isMaster": false,
                            >        "mimetype": "video/webm",
                            >        "resolution": [
                            >          640,
                            >          360
                            >        ],
                            >        "uri": "https://tobira-test-oc.ethz.ch/static/mh_default_org/engage-player/09828f52-b684-32b3-a614-cbb96fc63ee8/82d70840-8acc-41aa-9c0d-9236be3e4112/presentation_0dd34669_9a79_4a1b_be52_216ba65f4688.webm"
                            >      },
                            >      {
                            >        "flavor": "presentation/delivery",
                            >        "isMaster": false,
                            >        "mimetype": "video/mp4",
                            >        "resolution": [
                            >          1280,
                            >          720
                            >        ],
                            >        "uri": "https://tobira-test-oc.ethz.ch/static/mh_default_org/engage-player/09828f52-b684-32b3-a614-cbb96fc63ee8/5f782138-8194-4368-8543-26c284d2b168/presentation_0dd34669_9a79_4a1b_be52_216ba65f4688.mp4"
                            >      },
                            >      {
                            >        "flavor": "presentation/delivery",
                            >        "isMaster": false,
                            >        "mimetype": "video/webm",
                            >        "resolution": [
                            >          1280,
                            >          720
                            >        ],
                            >        "uri": "https://tobira-test-oc.ethz.ch/static/mh_default_org/engage-player/09828f52-b684-32b3-a614-cbb96fc63ee8/4b776ef3-f1bd-4fe9-be16-f828374cdd2a/presentation_0dd34669_9a79_4a1b_be52_216ba65f4688.webm"
                            >      },
                            >      {
                            >        "flavor": "presentation/delivery",
                            >        "isMaster": false,
                            >        "mimetype": "video/mp4",
                            >        "resolution": [
                            >          640,
                            >          360
                            >        ],
                            >        "uri": "https://tobira-test-oc.ethz.ch/static/mh_default_org/engage-player/09828f52-b684-32b3-a614-cbb96fc63ee8/ccab01b9-f1c6-45b0-a6a5-c4648c5d96dc/presentation_0dd34669_9a79_4a1b_be52_216ba65f4688.mp4"
                            >      }
                            >    ],
                            >    "updated": 1626161268818
                            >  }