refactor: migrate DelegationController to @metamask/messenger

[mikesposito]

Explanation

This PR migrates DelegationController 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

---

Note

Migrates DelegationController to @metamask/messenger, updates controller/test imports to @metamask/base-controller/next, and renames metadata anonymous to includeInDebugSnapshot.

• DelegationController:
  • Switch to @metamask/messenger (messenger.call, controller-specific messenger) and update types to Messenger.
  • Import BaseController/StateMetadata from @metamask/base-controller/next.
  • Rename metadata key anonymous -> includeInDebugSnapshot.
  • Replace internal calls from messagingSystem.call to messenger.call.
• Tests:
  • Rework messenger mocks to use @metamask/messenger with namespacing/delegation.
  • Update deriveStateFromMetadata import and metadata key usage.
• Package/Config:
  • Add dependency @metamask/messenger and TS project references.
  • Update changelog with BREAKING changes (new messenger, metadata key rename).
• Docs:
  • Update README dependency graph (add delegation_controller --> messenger, add eip_7702_internal_rpc_middleware --> controller_utils).

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[mcmire]

Need to resolve conflicts :(

[cryptodev-2s]

LGTM!