feat/cq-calendar-month-intervals

[DaZuiZui]

Implementation

This change adds calendar-aware mo and y durations to Continuous Query EVERY and RANGE clauses.

• Parse CQ durations into structured (monthPart, nonMonthDuration) values instead of flattening calendar units into fixed milliseconds.
• Preserve structured durations when they are inherited from GROUP BY TIME.
• Calculate CQ occurrences and RANGE boundaries from the original boundary in the persisted CQ time zone, applying calendar months first and fixed-duration components afterward.
• Handle month-end clamping, leap years, DST transitions, omitted boundaries, and mixed calendar/fixed durations.
• Add versioned structured duration fields to TCreateCQReq, while retaining legacy fixed-duration fields and compatibility handling for existing requests and snapshots.
• Persist calendar-aware CQ metadata, boundary information, time zone, and occurrence progress across restart, leader recovery, and snapshot recovery.
• Advance CQ progress using token/index validation so stale or duplicated callbacks cannot create competing schedules.
• Calculate execution timeouts from the actual distance between adjacent calendar occurrences.
• Add checked duration parsing/arithmetic, semantic validation, i18n messages, and focused tests for parsing, scheduling, persistence, recovery, and compatibility.

Fixes #18428