refactor: migrate NameController to @metamask/messenger

[cryptodev-2s]

Explanation

This PR migrates NameController to the new @metamask/messenger message bus, as opposed to the one exported from @metamask/base-controller.

References

• Related to Implement messenger delegation #5626

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Migrates NameController to the new @metamask/messenger, renames metadata anonymous to includeInDebugSnapshot, and updates imports, tests, and build references.

• NameController:
  • Migrate to @metamask/messenger (Messenger) and replace RestrictedMessenger; update generics/types.
  • Switch imports to @metamask/base-controller/next.
  • Rename metadata anonymous -> includeInDebugSnapshot; update stateMetadata and usages.
  • Update tests to reflect new metadata key and deriveStateFromMetadata import path.
• Package/Build:
  • Add dependency @metamask/messenger and TypeScript project references.
  • Update README dependency graph to include messenger links.
• Changelog:
  • Document breaking changes for messenger migration and metadata rename.

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[mcmire]

LGTM!