Add Spotify API support for Jams

[Exil_S]

Please add official API support for Spotify Jams. The current Web API does not provide any way to access or manage Jam sessions. It would be useful to have endpoints to:

• List active Jams

• Join or leave a Jam

• View Jam members and queue

• Add tracks to a Jam

• Control playback in a Jam

This would allow developers to build applications that support group listening and collaboration features. Please consider adding Jam support to the public API.