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>

Sources/DiscogsService/Catalogs/DiscogsService.docc/Extensions/APIProtocol.md

@@ -44,3 +44,43 @@
 - ``APIProtocol/deleteReleaseRatingByUser(path:headers:)``
 - ``APIProtocol/getReleaseStats(_:)``
 - ``APIProtocol/getReleaseStats(path:headers:)``
+
+### User Identity
+
+- ``APIProtocol/getUserProfile(_:)``
+- ``APIProtocol/getUserProfile(path:headers:)``
+- ``APIProtocol/postUserProfile(_:)``
+- ``APIProtocol/postUserProfile(path:query:headers:)``
+- ``APIProtocol/getUserContributions(_:)``
+- ``APIProtocol/getUserContributions(path:query:headers:)``
+- ``APIProtocol/getUserSubmissions(_:)``
+- ``APIProtocol/getUserSubmissions(path:headers:)``
+
+### User Collection
+
+- ``APIProtocol/getCollectionFolders(_:)``
+- ``APIProtocol/getCollectionFolders(path:headers:)``
+- ``APIProtocol/postCollectionFolders(_:)``
+- ``APIProtocol/postCollectionFolders(path:query:headers:)``
+- ``APIProtocol/getCollectionFolder(_:)``
+- ``APIProtocol/getCollectionFolder(path:headers:)``
+- ``APIProtocol/postCollectionFolder(_:)``
+- ``APIProtocol/postCollectionFolder(path:query:headers:)``
+- ``APIProtocol/deleteCollectionFolder(_:)``
+- ``APIProtocol/deleteCollectionFolder(path:headers:)``
+- ``APIProtocol/getCollectionItemsByRelease(_:)``
+- ``APIProtocol/getCollectionItemsByRelease(path:headers:)``
+- ``APIProtocol/getCollectionItemsByFolder(_:)``
+- ``APIProtocol/getCollectionItemsByFolder(path:query:headers:)``
+- ``APIProtocol/postReleaseToCollectionFolder(_:)``
+- ``APIProtocol/postReleaseToCollectionFolder(path:headers:)``
+- ``APIProtocol/postChangeRatingOfRelease(_:)``
+- ``APIProtocol/postChangeRatingOfRelease(path:query:headers:body:)``
+- ``APIProtocol/deleteInstanceFromCollectionFolder(_:)``
+- ``APIProtocol/deleteInstanceFromCollectionFolder(path:headers:)``
+- ``APIProtocol/getCustomFields(_:)``
+- ``APIProtocol/getCustomFields(path:headers:)``
+- ``APIProtocol/editFieldsInstance(_:)``
+- ``APIProtocol/editFieldsInstance(path:query:headers:)``
+- ``APIProtocol/getCollectionValue(_:)``
+- ``APIProtocol/getCollectionValue(path:headers:)``

Sources/DiscogsService/Catalogs/DiscogsService.docc/Extensions/Client.md

@@ -31,3 +31,26 @@
 - ``Client/putReleaseRatingByUser(_:)``
 - ``Client/deleteReleaseRatingByUser(_:)``
 - ``Client/getReleaseStats(_:)``
+
+### User Identity
+
+- ``Client/getUserProfile(_:)``
+- ``Client/postUserProfile(_:)``
+- ``Client/getUserContributions(_:)``
+- ``Client/getUserSubmissions(_:)``
+
+### User Collection
+
+- ``Client/getCollectionFolders(_:)``
+- ``Client/postCollectionFolders(_:)``
+- ``Client/getCollectionFolder(_:)``
+- ``Client/postCollectionFolder(_:)``
+- ``Client/deleteCollectionFolder(_:)``
+- ``Client/getCollectionItemsByRelease(_:)``
+- ``Client/getCollectionItemsByFolder(_:)``
+- ``Client/postReleaseToCollectionFolder(_:)``
+- ``Client/postChangeRatingOfRelease(_:)``
+- ``Client/deleteInstanceFromCollectionFolder(_:)``
+- ``Client/getCustomFields(_:)``
+- ``Client/editFieldsInstance(_:)``
+- ``Client/getCollectionValue(_:)``