refactor: impl vfolder RBAC APIs

[fregataa]

implement basic functions and APIs for RBAC design

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Update of end-to-end CLI integration tests in ai.backend.test
• API server-client counterparts (e.g., manager API -> client SDK)
• Test case(s) to:
  • Demonstrate the difference of before/after
  • Demonstrate the flow of abstract/conceptual models with a concrete implementation
• Documentation
  • Contents in the docs directory
  • docstrings in public interfaces and type annotations

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📚 Documentation preview 📚: https://sorna--2137.org.readthedocs.build/en/2137/

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📚 Documentation preview 📚: https://sorna-ko--2137.org.readthedocs.build/ko/2137/

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[fregataa]

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• refactor: impl vfolder RBAC APIs #2137 : 2 dependent PRs (#2138 , #2264 ) 👈
• chore: Add vfolders.domain_name and vfolder_permissions.id #2271
• main

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