[Feature Request] Add INVITE_BROWSER support for shelteRPC

[Milkshiift]

Is your feature request related to a problem? Please describe. Currently, to accept an invite in a standalone client with shelteRPC you have to either log into Discord in a browser or send the link to a text channel in the client.

Describe the solution you'd like arRPC sends an "INVITE_BROWSER" command when a Discord invite link is accepted in a browser. ShelteRPC could join the guild when such message is received.

Additional context INVITE_BROWSER command would need to be implemented in rsRPC