- Fix LSP completion for options. - Add LSP document highlighting support. - Add LSP completion for fully-qualified type references. - Improve LSP semantic tokens implementation (for syntax highlighting). - Add LSP organize imports code action to add missing imports, remove unused imports, and sort imports alphabetically. - Add LSP document link support. - Add LSP folding range support. - Update `PROTOVALIDATE` lint rule to support checking `cel_expression` fields for valid CEL.