refactor: migrate UserOperationController to @metamask/messenger

[cryptodev-2s]

Explanation

This PR migrates UserOperationController 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 UserOperationController to use @metamask/messenger, updates BaseController vNext types, renames metadata anonymous to includeInDebugSnapshot, and adjusts tests/configs/deps.

• UserOperationController
  • Migrate from RestrictedMessenger to new Messenger (@metamask/messenger); replace messagingSystem calls with messenger.
  • Adopt @metamask/base-controller/next types (ControllerGetStateAction, ControllerStateChangeEvent).
  • Rename state metadata anonymous -> includeInDebugSnapshot.
  • Construct SnapSmartContractAccount with messenger; fetch provider via messenger.call.
• Tests
  • Update imports to @metamask/base-controller/next and expectations for includeInDebugSnapshot; mock messenger interface.
• Dependencies/Config
  • Add dependency @metamask/messenger@^0.3.0 and TS project references; update README dependency graph.
• Changelog
  • Document BREAKING changes: new Messenger requirement and metadata key rename.

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