internal/lru: improve concurrency with RWMutex

[miladev95]

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

Replaced mutex in internal/lru/lru.go with sync.RWMutex.
Switched read-only methods to use RLock/RUnlock: Contains, Peek, GetOldest, KeyValues, Keys, Values, Len.
No behavioral changes besides mutex usage.

[propel-code-bot]

Switch LRU cache mutex to sync.RWMutex

Replaces the LRU.mu field with sync.RWMutex and updates read-only helpers to acquire RLock/RUnlock. No functional behavior changes are intended beyond improved read concurrency for the LRU cache.

Key Changes

• Replaced LRU.mu from sync.Mutex to sync.RWMutex in internal/lru/lru.go.
• Adjusted read-only methods (Contains, Peek, GetOldest, KeyValues, Keys, Values, Len) to use RLock/RUnlock.

Affected Areas

• internal/lru/lru.go

This summary was automatically generated by @propel-code-bot