Feat/extra resource loading from npm

[jkiddo]

This feature is backwards compatible and introduces the option to load e.g. example packages from IG's based on configuration

[jamesagnew]

This functionality would probably make sense to just roll into the base PackageInstallationSpec. I'd rather not have this project implementing novel features not actually found in the base project, that's hard for support.

[jkiddo]

Sure ... I can make a PR to the base getting the additionalResourceFolders added the PackageInstallationSpec.

[jkiddo]

@jamesagnew whats your take on the refactored version of the PostConstruct I've done here in https://github.com/hapifhir/hapi-fhir-jpaserver-starter/pull/784/files#diff-0f42a12718125be49d417ad9c402f5f2cecddfb7cb0ecfde364ad09132fa2a99R21 as mentioned in #758

[jkiddo]

and btw - the same thing I did on https://github.com/hapifhir/hapi-fhir-jpaserver-starter/pull/784/files#diff-cca286d85a1c14aea8b529430ecd47aa4a803b53f4c7816deb7d602bd2af3268R11 can be done for a loooooong range of interceptor logic currently handled in the already way-too-big

hapi-fhir-jpaserver-starter/src/main/java/ca/uhn/fhir/jpa/starter/common/StarterJpaConfig.java

Line 262 in 792f520

public RestfulServer restfulServer(

method (I'm not pointing fingers here as I most likely authored a lot of it myself).

[jkiddo]

@jamesagnew I'll move the additional sources logic once its been merged in here - acceptable for you? Then we can merge this into #785 and remove it from the starter as soon as it can be resolved from a snapshot in core.