Extract peer and target

[tosettil-polimi]

Extract peer and target

Refactor Tx Load Tool: Modularize Load Target and Peer Logic

Description:

This PR refactors the transaction load testing tool to improve modularity, maintainability, and separation of concerns. The main changes include:

• ✅ Modularized logic for transaction generation and sending:

  • Introduced LoadTarget in a new file (load_target.go) to encapsulate wallet and transaction handling.
  • Introduced Peer abstraction (peer.go) for managing P2P connections and reading transaction messages.

• ♻️ Moved and cleaned up logic from tx_load_tool.go:

  • Removed inline transaction generation and P2P connection logic from the Load struct.
  • Added a dedicated generateAndSendTx method for clarity and error handling.
  • Replaced custom TCP connection logic with the Peer abstraction for better encapsulation.

• 🧹 Code simplifications and minor cleanups:

  • Removed redundant code.
  • Updated comments and renamed variables for clarity.
  • Changed var errDisc error = ... to idiomatic var errDisc = ....

Why?

• Improves readability and testability of load testing logic.
• Makes the transaction load module easier to extend and maintain.
• Prepares codebase for future enhancements (e.g. multiple peers, dynamic load patterns).

No functional changes expected

This is a pure refactor. Functional behavior remains the same.