Hi, this pull request adds support for `rubocop` language server. I noticed that `ruby-lsp` LS is becoming more popular but it still lacks diagnostics support in Zed. To cover that missing feature, it could be good to use `rubocop` LS to show diagnostics alongside with the running Ruby LSP. Release Notes: - N/A --------- Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>