chore: Update Web3Auth controllers to expose all methods through messenger

[Mrtenz]

Explanation

This updates the following controllers to expose all methods through the messenger in a standardised way:

• SeedlessOnboardingController.
• ShieldController.
• SubscriptionController.
• ClaimsController.

References

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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

---

Note

Medium Risk
Expands the messenger API surface for controllers (including seedless onboarding/auth flows), which could affect consumers and access patterns if action names/types are miswired. Core logic appears unchanged, but messaging wiring errors would break controller calls at runtime.

Overview
Exposes all public methods on ClaimsController and SeedlessOnboardingController through their messengers by registering method handlers and introducing auto-generated *-method-action-types.ts type unions for the new action names.

Updates @metamask/claims-controller exports to re-export the new action types, adds a generate-method-action-types script (and tsx devDependency) to both packages, and adjusts ClaimsController tests to call methods via rootMessenger.call('Controller:method', ...) instead of invoking controller methods directly. Changelogs are updated to document the newly available messenger actions and exported action types.

^{Written by Cursor Bugbot for commit f18b535. This will update automatically on new commits. Configure here.}

[mcmire]

Why is it necessary to change this?

[Mrtenz]

The extraction script assumes we can use Controller['method'], but without these defaults that would result in a TypeScript error because the type parameters are missing.

[mcmire]

Ah, right, I see. That makes sense.

[mcmire]

Looks good, other than the conflicts.