Add ERC-165 detection for ERC6909TokenSupply and ERC6909Metadata

[arr00]

ERC-6909 defines three extensions which we implement. These extensions have their own intefaces but we didn't add ERC-165 detection for these interfaces.

#6246 flagged this issue and fixed it for ERC6909ContentURI. This PR fixes it for ERC6909TokenSupply and ERC6909Metadata.

We will keep the fix for ERC6909ContentURI seperate to ensure credit is given properly. There will only be one changeset for all the changes which will be part of this PR.

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7b02ef0

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 1 package

Name	Type
openzeppelin-solidity	Patch

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[coderabbitai]

Walkthrough

This pull request adds ERC165 interface detection support to two ERC6909 extensions. The ERC6909Metadata and ERC6909TokenSupply contracts now implement supportsInterface functions that advertise their respective interface identifiers while delegating to parent implementations. Corresponding test coverage has been added to verify interface support, and the interface behavior test utility has been updated with the new ERC6909Metadata and ERC6909TokenSupply interface signatures.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding ERC-165 detection for two ERC6909 extensions (ERC6909TokenSupply and ERC6909Metadata), which is the primary objective of the changeset.
Description check	✅ Passed	The PR description clearly explains the purpose: adding ERC-165 detection for ERC6909TokenSupply and ERC6909Metadata extensions, referencing related issue #6246.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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