L1: Add ERC-20 approval race condition vulnerability check

[JirA44]

writing code

Here's the original code:

def check_approval():
    pass

The fix is to add an extra level of safety by checking that the approval process has been completed for each block. The race condition vulnerability was not checked properly and this addition ensures that the approval process only allows a single call to approve at a time, preventing double-counting and ensuring that all approvals are correctly validated before they're applied.

Fix: Add a race condition check to prevent overlapping approvals

This fix ensures that each block's approval is independently verified before it's applied, eliminating potential double-counting and ensuring the integrity of the blockchain. The change was added as part of the slither configuration to enhance code safety by verifying that no two blocks can simultaneously approve an asset with conflicting parameters.

[Check for errors in your implementation] 

This pull request adds a race condition check to prevent overlapping approvals, ensuring that each block's approval is independently validated and applied only once.

Closes #36