refactor: migrate TokenSearchDiscoveryController to @metamask/messenger

[cryptodev-2s]

Explanation

This PR migrates TokenSearchDiscoveryController 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 TokenSearchDiscoveryController to @metamask/messenger and renames metadata anonymous to includeInDebugSnapshot, with corresponding test, config, and docs updates.

• @metamask/token-search-discovery-controller:
  • Migrate to new Messenger from @metamask/messenger; update controller messenger types and constructor wiring.
  • Switch imports to @metamask/base-controller/next.
  • Rename state metadata anonymous → includeInDebugSnapshot.
  • Add dependency @metamask/messenger and update tsconfig project references.
  • Update CHANGELOG with BREAKING changes.
• Tests:
  • Replace restricted messenger helpers with new Messenger hierarchy; update metadata key usage.
• Docs/Repo:
  • Update README dependency graph (add token_search_discovery_controller --> messenger, eip_7702_internal_rpc_middleware --> controller_utils).
  • Align yarn.lock with new dependency.

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[mcmire]

LGTM!