Youtube api improvements (#2277)

* Put youtube API functions under the YoutubeAPI namespace

* Implement the following endpoints:
  - `next`
  - `player`
  - `resolve_url`

* Allow a ClientConfig to be passed to YoutubeAPI endpoint handlers.

* Add constants for many new clients

* Fix documentation of YoutubeAPI.browse(): Comments and search
  result aren't returned by the browse() endpoint but by the next()
  and search() endpoints, respectively.

* Accept gzip compressed data, to help save on bandwidth

* Add debug/trace logging

* Other minor fixes

src/invidious/channels/playlists.cr

@@ -1,6 +1,6 @@
 def fetch_channel_playlists(ucid, author, continuation, sort_by)
   if continuation
-    response_json = request_youtube_api_browse(continuation)
+    response_json = YoutubeAPI.browse(continuation)
     continuationItems = response_json["onResponseReceivedActions"]?
       .try &.[0]["appendContinuationItemsAction"]["continuationItems"]
 

src/invidious/channels/videos.cr

@@ -61,7 +61,7 @@ def get_channel_videos_response(ucid, page = 1, auto_generated = nil, sort_by =
   continuation = produce_channel_videos_continuation(ucid, page,
     auto_generated: auto_generated, sort_by: sort_by, v2: true)
 
-  return request_youtube_api_browse(continuation)
+  return YoutubeAPI.browse(continuation)
 end
 
 def get_60_videos(ucid, author, page, auto_generated, sort_by = "newest")