Implemented the User Collection endpoints (#12)

This PR contains the work done to implement the *User Collection* endpoints of the Discogs API into the `OpenAPI` specification document:

* GET `/users/{username}/collection/folders`
* POST `/users/{username}/collection/folders`
* GET `/users/{username}/collection/folders/{folder_id}`
* POST `/users/{username}/collection/folders/{folder_id}`
* DELETE `/users/{username}/collection/folders/{folder_id}`
* GET `/users/{username}/collection/releases/{release_id}`
* GET `/users/{username}/collection/folders/{folder_id}/releases`
* POST `/users/{username}/collection/folders/{folder_id}/releases/{release_id}`
* POST `/users/{username}/collection/folders/{folder_id}/releases/{release_id}/instances/{instance_id}`
* DELETE `/users/{username}/collection/folders/{folder_id}/releases/{release_id}/instances/{instance_id}`
* GET `/users/{username}/collection/fields`
* POST `/users/{username}/collection/folders/{folder_id}/releases/{release_id}/instances/{instance_id}/fields/{field_id}`
* GET `/users/{username}/collection/value`

Reviewed-on: #12
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/data/documentation/discogsservice/operations/getuserprofile/output/equatable-implementations.json

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docs/data/documentation/discogsservice/operations/getuserprofile/output/ok-swift.struct/equatable-implementations.json

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