fix: prevent memory leak in AllocationPriorityQueue with bounded map

- Add MAX_PROCESSING_TIMES_SIZE limit (10,000 entries) to processingTimes map
- Implement periodic cleanup of stale entries (5-minute interval)
- Add proper disposal with cleanup interval clearing
- Extract magic numbers into PRIORITY_QUEUE_DEFAULTS and PRIORITY_WEIGHTS
- Add ensureNotDisposed guard for all public methods
- Add Symbol.asyncDispose support for proper resource cleanup

Author: DaMandal0rian