multicall and sendCalls collaboration

[YouStillAlive]

closes #85

[Copilot]

Pull Request Overview

Adds a new useBatchTransaction hook to support atomic EIP-7702 batch transactions and exports related batch types.

• Introduces batch-related type definitions (allowed contracts, call/options/result/status, hook return shape).
• Implements encoding and sending of batch calls with wagmi's useSendCalls and exposes status helpers.
• Updates index exports to surface the new hook and types.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
src/types/batchTypes.ts	Defines type system for batch transactions (calls, options, result, status, hook return).
src/index.ts	Re-exports the new hook and associated batch types for library consumers.
src/hooks/useBatchTransaction.ts	Implements the batching logic: preparing, encoding, sending, status tracking, and result shaping.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}