Cucumber/Gherkin support for Zed

WIP Zed extension to add support for Cucumber/Gherkin.

Features

• Gherkin Tree-Sitter Grammar (via thlcodes/tree-sitter-gherkin), including

  • highlights
  • injections (for docstring)
  • outline

• LSP (via @cucumber/languageserver)

  • looks for global executable cucumber-language-server first, installs/uses latest package @cucumber/language-server otherwise
  • supports configuration via project setting, e.g.

    {
      "lsp": {
        "cucumber": {
          "settings": {
            "glue": ["src/**/*.ts"]
          }
        }
      }
    }

  • Hint: currently @cucumber/language-server uses a node-tree-sitter version that does not support Node 19/20