Add LRU cache eviction to CachingStateProvider (#37214)

* Add LRU cache eviction to CachingStateProvider

Fixes #37213

Implements LRU (Least Recently Used) cache eviction to prevent
unbounded memory growth in long-running workers. Adds configurable
maxCacheSize parameter (default: 1000 entries) and maintains LRU
order using JavaScript Map's insertion order.

- Add maxCacheSize constructor parameter with default value of 1000
- Implement evictIfNeeded() to remove oldest entry when cache is full
- Implement touchCacheEntry() to move accessed items to end (LRU)
- Add comprehensive test coverage in state_provider_test.ts

This addresses the TODO comment in the code and improves reliability
for production workloads.

* Address review comments: size-based LRU eviction for CachingStateProvider

- Fixed bug: removed incorrect evictIfNeeded() call in promise callback
- Removed unnecessary this_ variable (arrow functions capture this)
- Changed from count-based to size-based eviction (similar to Python statecache.py)
- Added estimateSize() to calculate memory weight of cached values
- Default cache weight: 100MB
- Updated tests to work with weight-based eviction

* Fix prettier formatting

* Address review comments: circular references, eviction ordering, tests

- Fixed sizeof function to handle circular references using visited Set
- Fixed eviction ordering: add to cache first, then evict (fixes edge case)
- Added test for oversized item that exceeds maxCacheWeight
- Implemented custom sizeof instead of object-sizeof package (has Node.js compatibility issues)

* Address Gemini comments: fix race condition, optimize evictIfNeeded

- Fixed critical race condition in promise callback: only update cache if
  the entry is still the same promise we're resolving
- Optimized evictIfNeeded: use entries() iterator and removed redundant checks

Author: junaiddshaukat