Transitioning tests from hardat to foundry in solidity-util

[xdaniortega]

Context

Currently, some of our test are still running with Hardhat as the testing tool. However, we have decided to transition to Foundry for testing purposes. This change will require updating the existing test scripts and ensuring that they continue to pass with the new tool.

Proposed Solution:

1. Update the test scripts to use foundry instead of Hardhat.
2. Execute the test suite to ensure that all tests are passing with Foundry.
3. Make necessary changes to any failed tests to ensure they pass with the new tool.
4. Update documentation to reflect the new testing tool.

Expected outcome

The transition from Hardhat to Foundry should be smooth and should not affect the functionality of the system. The new test tool should provide more flexibility and better support for testing our application.