Add Memcached Cache as a new cache connector for the SmythOS

[bodyhedia44]

Description

This PR introduces MemcachedCache as a new cache connector for the SmythOS SRE platform, extending the caching capabilities.

Key Features Added:

• MemcachedCache Connector

  • Implements full-featured Memcached integration with get, set, delete, exists, and metadata operations.
  • TTL support via metadata management (expiresAt stored and validated).
  • updateTTL method for refreshing expiration.
  • ACL-aware operations integrated with SRE’s SecureConnector.

• Integration Tests

  • Verified core functionality: set/get, exists, delete, metadata handling, TTL updates, and expiration cleanup.

PR Goal

implementing not-yet-existing connectors for Storage providers, vector databases, or cache providers.

🔧 Type of Change

• ✨ New feature (non-breaking change that adds functionality)
• 🧪 Test improvements

✅ Checklist

• Self-review performed
• Unit & integration tests added (covering TTL, metadata, expiration, ACL bypass in tests)
• Documentation updated

[alaa-eddine-k]

Hey @bodyhedia44 Thank you for your contribution, this looks great !

we'll test it and merge it to a next release if all goes well :)

if we need any changes we will tag you here