feat: add sorbet Ruby LSP server option

[notchairmk]

Redo for #9 (unable to reopen after force-pushing to the branch for the original PR).

This adds Sorbet's LSP as an additional Ruby language server option and would take precedent over https://github.com/notchairmk/zed-sorbet.

In it's current state issues like notchairmk/zed-sorbet#6 will still be present. In addition, without get_executable_args being worktree-aware (and the extension being able to supply default args) the sorbet binary for a repo missing config at sorbet/config will fail to initiate. The workaround in zed-sorbet was to just supply empty config if that file is missing and allow for file-local errors.

These are the listed server capabilities

{
  "textDocumentSync": 1,
  "hoverProvider": true,
  "completionProvider": {
    "triggerCharacters": [
      ".",
      ":",
      "@",
      "#"
    ]
  },
  "definitionProvider": true,
  "typeDefinitionProvider": true,
  "implementationProvider": true,
  "referencesProvider": true,
  "documentHighlightProvider": true,
  "documentSymbolProvider": true,
  "workspaceSymbolProvider": true,
  "codeActionProvider": {
    "codeActionKinds": [
      "quickfix",
      "source.fixAll.sorbet",
      "refactor.extract",
      "refactor.rewrite"
    ],
    "resolveProvider": true
  },
  "documentFormattingProvider": false,
  "renameProvider": {
    "prepareProvider": true
  }
}

[vitallium]

@notchairmk Hi! I resolved the merge conflicts and copied the logic from the original extension, but I am not very familiar with sorbet. Could you please check the updates to this PR and let me know if we are ready to merge it? Thanks!

[notchairmk]

@vitallium can confirm this looks good, works for me, and should be good to merge. Thank you!

[vitallium]

@vitallium can confirm this looks good, works for me, and should be good to merge. Thank you!

Fantastic! Thank you!