Add WalletDb Initialization to MempoolNode::new() in src/mempool.rs

[Sophie-Ag00001]

PR Description: Add WalletDb Initialization to MempoolNode

Summary of Changes

This pull request implements WalletDb initialization within the MempoolNode::new() function in src/mempool.rs. The initialization pattern follows the same structure as implemented in src/miner.rs, ensuring consistency across components while setting up the database for the Mempool Node.

Motivation

The motivation behind this change is to establish a uniform approach to database initialization across different modules of our application. By incorporating WalletDb initialization in the MempoolNode, we enhance its functionality and facilitate better state management for transactions in the memory pool.

Context

WalletDb is essential for managing wallet-related data, and its proper integration within the Mempool Node ensures that the node can efficiently handle transaction information. This change is aligned with previous enhancements made in the miner module, contributing to a more cohesive codebase.

Testing Instructions

1. Clone the branch associated with this pull request.
2. Navigate to the src/mempool.rs file and verify that the changes to the MempoolNode::new() function are present.
3. Run the application's test suite to validate that there are no regressions and that the Mempool Node functions correctly with the new WalletDb initialization:

   cargo test

Known Issues or Limitations

• There are no known issues resulting from these changes, but thorough testing is recommended to confirm seamless integration with existing functionality.

Feel free to review and provide feedback on the proposed changes!