Add lavalink state (useful for resuming system)

[flav-code]

[Deivu]

Typings are not correctly specified, check github actions for info

[KagChi]

Any benefit of this?

[flav-code]

allows to know if the bot has been disconnected during a restart

[KagChi]

I dont get what you mean, this pr seems useless

[flav-code]

if you don't have a system to resume the players then it will be useless for you

[KagChi]

No i mean, this is not used internally by shoukaku it self. why dont you just extend the player instead?

[flav-code]

because it could be useful for other people and it doesn't impact the good functioning of shoukaku

[Deivu]

Instead of playerState, I'd call it connected, and do not make it type boolean|nulll instead make it only a boolean type that defaults to false until LL sends the first playerUpdate to this player. playerState = true is unclear on what it provides / says

[Deivu]

Could also be our own type, eg: type state = Connected | Disconnected | Unknown

[Deivu]

Closing due to inactivity, re-open if you applied the changes I said above