feat: add new actions to KeyringController

[hmalik88]

Explanation

Added actions for createNewVaultAndKeychain and createNewVaultAndRestore. These are meant to be consumed by the createNewMultichainAccountWallet method in the MultichainAccountService.

References

N/A

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

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Note

Adds messenger actions and handlers for createNewVaultAndKeychain and createNewVaultAndRestore, and documents them in the changelog.

• KeyringController:
  • Add action types KeyringControllerCreateNewVaultAndKeychainAction and KeyringControllerCreateNewVaultAndRestoreAction in src/KeyringController.ts.
  • Extend KeyringControllerActions union to include the new actions.
  • Register action handlers for ${name}:createNewVaultAndKeychain and ${name}:createNewVaultAndRestore.
• Docs:
  • Update packages/keyring-controller/CHANGELOG.md under Unreleased to note the new actions.

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