This adds extras to Playable for passing and accessing the userData field from Lavalink.
This PR implements a new class ExtrasNamespace which is just a small alteration of types.SimpleNamespace.
Checklist
[x] If code changes were made then they have been tested.
[x] I have updated the documentation to reflect the changes.
[x] I have updated the changelog with a quick recap of my changes.
[ ] This PR fixes an issue.
[x] This PR adds something new (e.g. new method or parameters).
[ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
[ ] This PR is not a code change (e.g. documentation, README, ...)
This adds extras to Playable for passing and accessing the
userDatafield from Lavalink. This PR implements a new classExtrasNamespacewhich is just a small alteration oftypes.SimpleNamespace.Checklist