Read/Write contact labels

[NathenSample]

Feature request

Route

POST/PUT /contacts/labels/

Authentication

Authenticated endpoint

Use case

Creation of new labels on the user.
@antihax/Lucia both maintain contact management tools, notably this would facilitate better OOG management, and the ability to copy contacts from other characters where they use labels the current account does not.

Route

GET /contacts/labels/

Authentication

Authenticated endpoint

Use case

Retrieval of created labels, and associated ID's
List existing labels, knowledge of when creation is required prior to use of a label in contact management software.

[CarbonAlabel]

Duplicate of #173.

[NathenSample]

ty @CarbonAlabel

[a-tal]

I do appreciate the formatting here, but we should probs close to the older, more thumbup'd issue