Implemented the missing Database endpoints (#8)

This PR contains the work done to declare the missing, non-GET endpoints of the *Database* section in the [Discogs API documentation](https://www.discogs.com/developers#page:database) into the `OpenAPI` specification document.

Furthermore, documentation extensions have been defined for the `APIProtocol` and `Client` types in the `DocC` documentation catalog to match the categories of these endpoint calls to the categories in the Discogs documentation.

Reviewed-on: #8
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

docs/data/documentation/discogsservice/authtransport/onquery.json

@@ -1 +1 @@
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+{"identifier":{"interfaceLanguage":"swift","url":"doc:\/\/DiscogsService\/documentation\/DiscogsService\/AuthTransport\/onQuery"},"hierarchy":{"paths":[["doc:\/\/DiscogsService\/documentation\/DiscogsService","doc:\/\/DiscogsService\/documentation\/DiscogsService\/AuthTransport"]]},"primaryContentSections":[{"kind":"declarations","declarations":[{"languages":["swift"],"tokens":[{"kind":"keyword","text":"case"},{"kind":"text","text":" "},{"kind":"identifier","text":"onQuery"}],"platforms":["macOS"]}]},{"content":[{"text":"Discussion","type":"heading","level":2,"anchor":"discussion"},{"type":"paragraph","inlineContent":[{"type":"text","text":"This means that the parameters will be injected into the query in a request, like this:"}]},{"syntax":"bash","type":"codeListing","code":["curl \"https:\/\/api.discogs.com\/database\/search?q=Slayer&key=foo123&secret=bar456\"","curl \"https:\/\/api.discogs.com\/database\/search?q=Slayer&token=abcxyz123456\""]}],"kind":"content"}],"variants":[{"paths":["\/documentation\/discogsservice\/authtransport\/onquery"],"traits":[{"interfaceLanguage":"swift"}]}],"abstract":[{"text":"Authentication credential are sent in a request as parameters in the query string.","type":"text"}],"metadata":{"role":"symbol","title":"AuthTransport.onQuery","externalID":"s:14DiscogsService13AuthTransportO7onQueryyA2CmF","modules":[{"name":"DiscogsService"}],"roleHeading":"Case","fragments":[{"kind":"keyword","text":"case"},{"kind":"text","text":" "},{"kind":"identifier","text":"onQuery"}],"symbolKind":"case"},"kind":"symbol","schemaVersion":{"major":0,"patch":0,"minor":3},"sections":[],"references":{"doc://DiscogsService/documentation/DiscogsService/AuthTransport":{"type":"topic","role":"symbol","kind":"symbol","fragments":[{"kind":"keyword","text":"enum"},{"kind":"text","text":" "},{"kind":"identifier","text":"AuthTransport"}],"navigatorTitle":[{"kind":"identifier","text":"AuthTransport"}],"title":"AuthTransport","url":"\/documentation\/discogsservice\/authtransport","identifier":"doc:\/\/DiscogsService\/documentation\/DiscogsService\/AuthTransport","abstract":[{"text":"A representation of the available transport options to send credentials in authenticated requests.","type":"text"}]},"doc://DiscogsService/documentation/DiscogsService/AuthTransport/onQuery":{"url":"\/documentation\/discogsservice\/authtransport\/onquery","role":"symbol","fragments":[{"kind":"keyword","text":"case"},{"kind":"text","text":" "},{"kind":"identifier","text":"onQuery"}],"title":"AuthTransport.onQuery","identifier":"doc:\/\/DiscogsService\/documentation\/DiscogsService\/AuthTransport\/onQuery","abstract":[{"text":"Authentication credential are sent in a request as parameters in the query string.","type":"text"}],"kind":"symbol","type":"topic"},"doc://DiscogsService/documentation/DiscogsService":{"type":"topic","title":"DiscogsService","url":"\/documentation\/discogsservice","role":"collection","abstract":[],"kind":"symbol","identifier":"doc:\/\/DiscogsService\/documentation\/DiscogsService"}}}