[Task 2] Implement Basic Proxy Mechanics

[thejhh]

The objective of Phase 2 is to establish the foundational layer of gomiddleman by developing its core functionality as a basic TCP proxy. This phase focuses on enabling the proxy to forward TCP traffic seamlessly between the client and the backend server without engaging in TLS interception or modification of the traffic. This functionality is crucial for establishing a reliable data path that will later be expanded to include mTLS capabilities.

Goals

• Proxy Setup: Create a simple, efficient TCP forwarding mechanism within the proxy.
• Connection Handling: Ensure the proxy can accept incoming TCP connections from clients and establish corresponding outbound connections to the designated backend server.
• Data Relay: Implement bidirectional traffic forwarding between the client and backend, ensuring data integrity
  and minimal latency.
• Concurrency Management: Utilize Go's concurrency model to handle multiple connections simultaneously, ensuring scalability.
• Basic Logging: Integrate basic logging for connection tracking and debugging purposes, providing insights into the proxy's operation.
• Error Handling: Develop robust error handling mechanisms for connection failures, ensuring the proxy can gracefully manage and log issues.

Testing and Validation

• Local Testing Environment: Set up a local testing environment with mock client and server applications to validate the proxy's basic forwarding functionality.
• Functionality Tests: Conduct tests to verify that the proxy correctly forwards TCP traffic without data loss