refactor: migrate SwapsController to @metamask/messenger

[mikesposito]

This PR migrates SwapsController to new @metamask/messenger instead of @metamask/base-controller. This is part of a larger effort to migrate all controllers to use @metamask/messenger.

• Fixes Replace RestrictedMessenger with delegated Messenger #405

---

Note

Replace base-controller RestrictedMessenger usage with @metamask/messenger, update controller/test wiring, and align metadata/debug flags.

• Controller (src/SwapsController.ts)
  • Switch to @metamask/base-controller/next and @metamask/messenger APIs.
  • Replace messagingSystem calls with messenger (registerActionHandler, subscribe, call).
  • Update state metadata keys from anonymous to includeInDebugSnapshot.
• Types (src/types.ts)
  • Change SwapsControllerMessenger to use @metamask/messenger.
• Tests (src/SwapsController.test.ts)
  • Refactor to new @metamask/messenger (Messenger, namespaces, delegation) and adjust imports.
  • Update deriveStateFromMetadata usage to includeInDebugSnapshot.
• Dependencies
  • Bump @metamask/base-controller to ^8.0.4 and add @metamask/messenger ^0.3.0.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​metamask/​messenger@​0.2.0 ⏵ 0.3.0	+1		+1	-1
	@​metamask/​base-controller@​8.3.0 ⏵ 8.4.0				-1

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[mcmire]

LGTM!

Hmm, looks like CI is failing.