Add C# tree-sitter language

[Tiggilyboo]

Created accompanying tree sitter support issue (Encompasses all languages) should anyone else want to tick some of these off.

• Requires tree-sitter-c-sharp PR: Tree sitter 0.20, Missing HIGHLIGHT_QUERY Rust binding tree-sitter/tree-sitter-c-sharp#221 to go upstream before merging this. Currently will fail build unless my fork is used instead (But I would encourage waiting on upstream...)

Let me know if I should have approached this differently.

Cheers

[bugadani]

From the experience we had with these kind of PRs, I think it would be better to add tree-sitter packages in batches. Each one of these causes at least one merge conflict that needs to be manually resolved, which is far from optimal.

I would also prefer rebasing rather than merging from master, as in my opinion that results in a nicer commit history (really, a merge isn't part of the set of proposed changes, it's just a side effect), but we don't really have rules here, so it's just me. :)

[bugadani]

Whoops, sorry for the ping, I didn't notice this doesn't compile because of the upstream crate.

[ghishadow]

Looks like upstream has merged PR, though this PR might need rebase

[bugadani]

Closing because #1104 was merged