feat: add query caching for EF Core and Dapper

[AmirTahan80]

Summary

Adds query caching capabilities to optimize query execution in both Entity Framework Core and Dapper.

Key Additions & Features

• Core Abstractions (PepperX.QueryForge):
  • IQueryCache and QueryCacheOptions: configurable caching interface supporting absolute expiration, sliding expiration, tags, and key prefixing.
  • MemoryQueryCache: high-performance in-memory cache implementation with automatic cleanup and tag invalidation.
  • QueryCacheKeyGenerator: deterministic SHA-256 cache key generation based on query criteria, selected columns, paging, sorting, and grouping.
  • Fluent extension methods (WithCache, WithCacheOptions, WithoutCache).
  • QueryForgeCache.Default: global cache provider accessor.
• Dapper Provider (PepperX.QueryForge.Dapper):
  • Integrated caching into QueryExecutor via DapperQueryForgeOptions.
  • Added fluent caching configuration on DapperQueryFluent.
• EF Core Provider (PepperX.QueryForge.EFCore):
  • Transparent second-level caching interceptor in ToQueryResultAsync and helper extensions ToQueryResultCachedAsync.
• Sample WebApi & Requests:
  • Added cached query endpoints for Dapper and EF Core (/api/users/cached, /api/efcore/users/cached).
  • Added cache management endpoints for tag-based invalidation and full cache clearing (/api/cache/invalidate, /api/cache/clear).
  • Updated Requests.http with sample requests covering cached queries and cache management.
• Unit & Provider Tests:
  • Full test suite covering cache operations, key generation, sliding TTL, tag invalidation, and execution across providers.