Implements bulk unnesting .

[steven2308]

Description

Describe the additions/improvements this PR contains.

Checklist

• Verified code additions
• Updated NatSpec comments (if applicable)
• Regenerated docs
• Ran prettier
• Added tests to fully cover the changes

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PR-Codex overview

Detailed summary

• Updated the node version in GitHub workflows from 16 to 18.
• Added new functions bulkTransferAllChildren and bulkTransferChildren to the RMRKBulkWriter contract.
• Added imports for IERC7401 and IERC6454 in RMRKBulkWriter.sol.
• Updated the bulkWriterFixture function in bulkWriter.ts to use the updated addresses.
• Updated the beforeEach function in the test file to use the updated addresses.

The following files were skipped due to too many changes: test/bulkWriter.ts

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[openzeppelin-code]

Implements bulk unnesting .

Generated at commit: 7d8398a663a5f016baa4d62d97e6c7eafda08fb0

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 5 24 29
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector