[Task]: TypeScript SDK: Add LRU cache eviction to CachingStateProvider

[junaiddshaukat]

What needs to happen?

Problem

The CachingStateProvider in sdks/typescript/src/apache_beam/worker/state.ts currently has unbounded cache growth. The cache can grow indefinitely, which can lead to memory issues in long-running workers. There's a TODO comment indicating this needs to be addressed:
cript
// TODO: (Perf) Cache eviction.## Proposed Solution

Implement LRU (Least Recently Used) cache eviction:

• Add a configurable maxCacheSize parameter (default: 1000 entries)
• Evict the least recently used entry when the cache reaches capacity
• Maintain LRU order by moving accessed items to the end of the Map

Benefits

• Prevents unbounded memory growth in long-running workers
• Improves reliability for production workloads
• Configurable cache size allows tuning based on use case

Implementation Details

• Use JavaScript Map's insertion order to track access order
• When cache is full, remove the first (oldest) entry
• On cache hit, move entry to end (most recently used)

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

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[junaiddshaukat]

.take-issue