Add basedpyright langserver

[baiyang1919813]

No description provided.

[David-Else]

This language server seems controversial if we are to believe the author of pyright: microsoft/pyright#8065 (comment). I don't have an opinion, but I think whoever approves this PR should have a quick look at the thread.

[the-mikedavis]

IMO the controversy isn't relevant. An editor having configuration for a language server doesn't imply any sort of favor for it or opinion about it - it's just compatibility. For example we have a default configuration for intelephense even though it's closed source and paid. (Not at all the same situation but sort of a similar idea)

[pascalkuthe]

We are not removing pyright in favor of this kne. Just havng both servers in the config allows users to use whatever they prefer which I think isn't controversial.

I am also well acquainted with pyrights issues. LSP in general has the issue of being vscode centric but pyright in particular has been a continously source of problems with little interest from maintainers to improve. I certainly understand where this fork is coming from.