Note

Normalize cache keys to lowercase and make cache regions/key lookups case-insensitive, with corresponding tests.

• Caching Core:
  • Introduce CacheKey.Normalize(object|string) to lowercase string keys.
  • Update CacheKey.With(Type, ...) to return normalized keys.
• PlatformMemoryCache:
  • Normalize keys in CreateEntry, TryGetValue, and Remove using CacheKey.Normalize.
• MemoryCacheExtensions:
  • Normalize keys in GetOrCreateExclusive and GetOrCreateExclusiveAsync.
• Cancellable Cache Regions:
  • Use case-insensitive storage and comparisons: _keyTokensDict = new(... OrdinalIgnoreCase), EqualsIgnoreCase, StartsWithIgnoreCase.
• Tests:
  • Add/extend unit tests verifying case-insensitive behavior for cache keys and token cancellation across PlatformMemoryCache, CancellableCacheRegion, and extension methods.

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