Add support for SWITCH COLD STORAGE role and status commands

[RaphDal]

Summary

Adds parser, AST, serialization, syntax-highlighting, and autocomplete support for the cold-storage role-switch commands introduced by questdb/questdb-enterprise#989.

SWITCH COLD STORAGE ROLE TO MANAGER;
SWITCH COLD STORAGE ROLE TO MANAGER FORCE TIMEOUT 10000;
SWITCH COLD STORAGE ROLE TO REFRESHER TIMEOUT 30000;
SWITCH COLD STORAGE STATUS;

Changes

• Registers COLD, FORCE, MANAGER, and REFRESHER in the public keyword grammar and lexer. They remain non-reserved, matching QuestDB behavior, so they can still be used as unquoted identifiers.
• Extends SWITCH parsing with:
  • SWITCH COLD STORAGE ROLE TO MANAGER [FORCE] [TIMEOUT <ms>]
  • SWITCH COLD STORAGE ROLE TO REFRESHER [TIMEOUT <ms>]
  • SWITCH COLD STORAGE STATUS
• Keeps FORCE manager-only in the grammar and autocomplete suggestions.
• Extends SwitchStatement with cold-storage role/status actions, MANAGER/REFRESHER roles, and the optional force flag.
• Preserves the new commands through parseToAst() → toSql() round trips and regenerates the CST declarations.
• Adds context-aware autocomplete for every step of the command, including FORCE and TIMEOUT placement.

Testing

• Lexer coverage for all new keywords.
• Parse and AST coverage for manager, forced manager, refresher, status, timeout, and mixed-case forms.
• Regression coverage proving the new non-reserved keywords remain valid identifiers.
• Round-trip coverage for every supported command shape.
• Autocomplete walkthrough coverage, including rejecting FORCE after REFRESHER.
• yarn test — 7000 passed (9 files)
• yarn typecheck — clean
• yarn lint — clean
• yarn build — ESM and CJS builds clean