libzcached: Client-side library compatible with CABI

[sectasy0]

Requirements:

1. CABI Compatibility: Ensure the client-side library is fully compatible with CABI standards, enabling interoperability with various programming languages and platforms.
2. Connection Pooling: Implement connection pooling to manage multiple connections efficiently and reduce latency.
3. Core Functionality: Provide functions for connecting to the server, setting and getting key-value pairs, and handling errors.
4. Thread Safety: Ensure the library is thread-safe, allowing concurrent operations without conflicts.
5. Error Handling: Implement robust error handling using result monad.
6. Documentation: Provide comprehensive documentation for the library, including usage examples, API references, and integration guides.