Add configurable HTTP and gRPC request logging

[ctindel]

Environment Variable-Based HTTP Request/Response Logging

Key Changes:

• Simplified logging implementation to use WEAVIATE_LOG_LEVEL environment variable
• Removed custom logger approach completely
• Improved sensitive header masking for security
• Added comprehensive test coverage
• Cleaned up code:
  • Removed debug print statements
  • Removed unnecessary imports
  • Added grpc-stubs and removed unnecessary type ignore comments

Test Coverage:

• Default logging behavior (INFO level)
• Debug logging with sensitive header masking
• Concurrent request logging
• Invalid log level handling
• gRPC request/response logging