Address Race Condition

[dcbickfo]

• There was a race condition tied to loading and then deleting a key without checking it hadn't changed

[Copilot]

Pull Request Overview

This PR addresses a race condition in the cache-aside implementation by refactoring the lock mechanism to use context-based cancellation instead of simple channels. The changes improve robustness by ensuring locks are properly cleaned up and context cancellation is respected throughout the system.

• Replaced simple channel-based locks with context-aware lock entries that auto-cancel after lockTTL
• Added proper error handling and logging for lock cleanup operations
• Fixed a bug in multi-key operations and improved context cancellation handling

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
cacheaside.go	Core implementation changes including new lockEntry struct, context-based lock management, improved error handling, and bug fixes
cacheaside_test.go	Added test case to verify parent context cancellation behavior during lock waiting

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