refactor: migrate EarnController to @metamask/messenger

[mikesposito]

Explanation

This PR migrates the EarnController class to the new @metamask/messenger comm system, 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 EarnController from RestrictedMessenger to @metamask/messenger, updates state metadata keys, and aligns tests, configs, and docs.

• EarnController:
  • Migrate messaging from RestrictedMessenger to @metamask/messenger with new typed Messenger and delegate usage; replace messagingSystem calls with messenger.call/subscribe.
  • Update imports to @metamask/base-controller/next.
  • Rename metadata key anonymous to includeInDebugSnapshot and adjust values.
• Tests (packages/earn-controller/src/EarnController.test.ts):
  • Switch to @metamask/messenger root and namespaced messengers; update types; adjust deriveStateFromMetadata selector to includeInDebugSnapshot.
• Package/Config:
  • Add dependency @metamask/messenger and TS project references.
• Docs:
  • Update dependency graph in README.md to link earn_controller → messenger and add eip_7702_internal_rpc_middleware → controller_utils.
• Changelog:
  • Note breaking changes: new Messenger requirement and metadata key rename.

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[ffmcgee725]

LGTM

[mcmire]

LGTM!

[cryptodev-2s]

LGTM!