Add integration for Swift-MesonLSP

[JCWasmx86]

See #119

Features

• Download and setup binaries for MacOS/Windows (For windows: Requires a zip file due to depending on some DLLs that can't be statically linked)
  • Download binaries
  • Check checksum
  • Extract zip file (Requires external library)
  • Make lsp.ts use the downloaded file
• Code style/Formatting
• Figure out if something went wrong with yarn.lock and if yes what went wrong (Doesn't seem to be something bad)
• Get rid of curl usage to download file
• Don't require users to restart VSCode
• Add language server to https://langserver.org/ ? (See Add to langserver.org JCWasmx86/mesonlsp#11)

[JCWasmx86]

I think this is ready for review.

Automatic updates are currently not implemented as I don't know what the best way would be.

This adds a few dependencies:

• which to find the language server on the path
• adm-zip to extract the downloaded zip

lsp.ts is based a bit on the Vala VSCode extension (MIT)

[tristan957]

The clangd, codeql, rust analyzer extensions might be good to look at for inspiration on auto updating.

[JCWasmx86]

Run tsc --noEmit --noErrorTruncation --pretty false
Error: src/utils.ts(31,33): error TS2322: Type 'ExecFileException | undefined' is not assignable to type 'ExecException | undefined'.
  Type 'ExecFileException' is not assignable to type 'ExecException | undefined'.
    Type 'ExecFileException' is not assignable to type 'ExecException'.
      Types of property 'code' are incompatible.
        Type 'string | number | null | undefined' is not assignable to type 'number | undefined'.
          Type 'null' is not assignable to type 'number | undefined'.
Error: Process completed with exit code 2.

Not sure why exactly it breaks, but I broke it (Albeit I haven't touched the file)

I've fixed it, but it requires changing unrelated code

[tristan957]

Did you rebase on master? Some new workflows and things got added

[JCWasmx86]

Yes, already reformatted everything

[JCWasmx86]

I've accidentally bumped the @types/node version during fixing conflicts, but it's fixed now

[tristan957]

Ha. Thanks for rebasing :).

[JCWasmx86]

I've bumped to 2.4.4 a version that has a few auto-completion improvements. For this release there won't be any improvements to the formatting of tooltips during hovering.

But I think for now it's good enough to merge this PR