Add tests for reentrancy in _rentStorage function

[Pawar7349]

Motivation

This pull request addresses potential reentrancy vulnerabilities in the _rentStorage function of the IdGateway contract. It is crucial to secure the contract against reentrancy attacks to prevent unintended behaviors and potential financial losses.

Change Summary

Implemented a new test contract RentStorageTest to specifically target and test for reentrancy issues in the _rentStorage function.

Added comprehensive test cases to verify the robustness of the _rentStorage function against reentrancy attacks.

Ensured that the function handles overpayment, exact payment, and edge case scenarios correctly.

Merge Checklist

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Additional Context

The test suite covers various edge cases, ensuring the _rentStorage function's reliability and security. These tests help maintain the integrity and trustworthiness of the IdGateway contract.

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PR-Codex overview

This PR refines the _rentStorage function in IdGateway.sol by changing how overpayment is calculated and transferred to the payer. It introduces a more secure method for sending funds and ensures proper calculation before external calls.

Detailed summary

• Updated _rentStorage function to calculate overpayment after determining the amountToRent.
• Changed the way overpayment is sent to payer using call instead of sendNative.
• Added a require statement to check the success of the payment transfer.
• Kept the receive function to restrict access to storageRegistry.

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