chore: Expose missing KeyringController methods through the messenger

[GuillaumeRx]

Explanation

This exposes missing methods used in the clients through the messenger after #8391

References

• Progresses https://consensyssoftware.atlassian.net/browse/WPC-989

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

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Note

Medium Risk
Broadens the messenger API surface to include password/key export and lock/unlock-related actions, which are sensitive operations even though underlying implementations are unchanged.

Overview
Exposes additional KeyringController capabilities via the messenger. The controller now allowlists and types new messenger actions for changePassword, verifyPassword, submitPassword, submitEncryptionKey, setLocked, exportEncryptionKey, exportAccount, importAccountWithStrategy, and getAccountKeyringType.

Updates the generated method action-type union/exports and adds an Unreleased changelog entry documenting the newly available actions.

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