feat: add low-level deferred action support

[Zer0dot]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR introduces enhancements to the deferralActions functionality in the smart account system, allowing for deferred actions to be signed and executed with improved nonce handling and signature management.

Detailed summary

• Updated nonce handling in initUserOperation.ts to support overrides.
• Added SignatureType enum in utils.ts for signature categorization.
• Integrated SignatureType in nativeSMASigner and singleSignerMessageSigner for signature handling.
• Introduced new types and methods in DeferralActions.ts for deferred actions.
• Implemented tests for deferred action functionality in client.test.ts.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 21, 2025 4:22pm
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