feat: grlx LSP server in Go

LSP server for grlx recipe files (.grlx) providing:

- Completion for ingredients, methods, properties, requisite types,
  and step ID references
- Diagnostics for unknown ingredients/methods, missing required
  properties, unknown properties, and invalid requisite types
- Hover documentation for all ingredients and methods with property
  tables
- Full schema for all 6 grlx ingredients (cmd, file, group, pkg,
  service, user) with accurate properties from the grlx source

.gitignore

@@ -0,0 +1,2 @@
+grlx-lsp
+dist/