Rename toString to toStringSigned

[balajipachai]

Fixes #4298

• Adds a StringsMock contract
• From within the StringsMock contract's constructor a call is made to Strings.toStringSigned(100)
• Added tests and it is passing

PR Checklist

• [All Passing] Tests
• [No Change] Documentation
• [None] Changeset entry (run npx changeset add)

[changeset-bot]

🦋 Changeset detected

Latest commit: 2a39ea1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
openzeppelin-solidity	Major

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[Amxx]

We don't need a StringsMock, we use hardat-exposed to generate the test contracts.

[Amxx]

This is not fixing the PR linked.

[balajipachai]

Sure, I wasn’t aware of hardhat-exposed, will work on the review changes.

[frangio]

This PR is not right. As #4298 says, we have to rename toString(int256) into toStringSigned(int256).

[balajipachai]

This PR is not right. As #4298 says, we have to rename toString(int256) into toStringSigned(int256).

Ok, ok, got it, I renamed uint256, I will update, thank you.

[Amxx]

Code is good, but we need a changeset entry.

[balajipachai]

Code is good, but we need a changeset entry.

Will add one

[frangio]

Thanks!