refactor: remove lsp and vscode

[stringhandler]

Removes the LSP and VS Code extension from this repo and into https://github.com/BlockstreamResearch/simplicityhl-lsp

Motivation

When trying to update rust-simplicity in #314 I am unable to get the full project to pass CI. This is because the LSP project references Simplicity via a crates version.

As it stands, there are usually multiple PRs to update the LSP after code in the rest of the project is edited.

[ivanlele]

On the CI side, for #314, I think we can make it pass without touching the LSP. From what I’ve seen, it’s a standalone crate and pulls simplicityhl from crates.io. It also seems to even use an older version: simplicityhl = "0.5.0-rc.0" (in the master we already have 0.6.0).

Some time ago, I created a commit with the new rust-simplicity version so I could continue working on a my feature. The CI passes without changing anything besides src and main manifest files, I hope it might help:
ivanlele@76f7d18

[KyrylR]

Make sense, though it would be nice to have to separate repos one for lsp another for vscode (to avoid ambiguity)

[stringhandler]

Yeah even better

[gerau]

I moved the vscode extension to its own repo: https://github.com/BlockstreamResearch/simplicityhl-vscode

[KyrylR]

@gerau should we proceed with removal?

[gerau]

Yes, we can.

[KyrylR]

ACK c3f0ce8; successfully ran local tests, docs and review