Add `ERC7674` (draft)

[Amxx]

Fixes #4959

ERC-7674 is still WIP, but having it implemented as a draft contract would be valuable for users

Pending discussions:

• [x] if (value > 0) {...} in ERC20._spendAllowance vs if (value > 0) super._spendAllowance(...) in ERC20TemporaryApproval
  • remove _approve call when value is 0
  • skip super call if temporary allowance covers everything
• [ ] emit event when temporary allowance is set/updated ?

PR Checklist

• [x] Tests
• [x] Documentation
• [x] Changeset entry (run npx changeset add)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 887121ca264af11fa63c5d260bf649b5de349cb9

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 | Minor |

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