Socket fixes and Python test speedup

[nehalkpatel]

Fixes use of ZMQ in C++ and Python for more robust sockets
Speeds up Python tests by waiting for events instead of fixed delays.

• ZMQ Factory Pattern in C++
• Connection State Management in C++
• Graceful Shutdown in C++
• Retry Logic in C++
• Configurable Timeouts in C++
• Logging vs. print in C++ and Python
• Single ZMQ Context in Python
• Proper lifecycle management in Python
• Recv timeout in Python
• Socket options in Python
• Proper cleanup in Python
• Update test fixtures to automatically clean up
• Configurable endpoints (but still hard-coded)