• 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.