Add delegation support to ContractFunc execute method and Wallet class

[devin-ai-integration]

Add delegation support to ContractFunc execute method and Wallet class

Summary

This PR adds utility methods to simplify EIP-7702 sponsored delegation transactions by abstracting the manual sponsor_delegation + sign + send flow into single method calls.

Key Changes:

1. Enhanced execute() method in ContractFunc to accept optional delegation parameters (delegate_wallet, chain_id, gas)
2. Added delegate_to_contract() method to BaseWallet for simple delegation without contract data
3. Updated example to demonstrate both new utility methods

Usage Examples:

# Enhanced execute with delegation
tx_hash = await counter.increment().execute(
    wallet=sponsor_wallet,
    delegate_wallet=delegate_wallet
)

# Simple wallet delegation
tx_hash = await delegate_wallet.delegate_to_contract(
    sponsor_wallet=sponsor_wallet,
    contract_address=counter_address
)

Review & Testing Checklist for Human

• End-to-end testing: Test both utility methods with real wallets on EIP-7702 compatible network
• Backward compatibility: Verify existing execute() calls still work without delegation parameters
• Type safety: Check that Optional parameter handling and overloads work correctly
• Edge cases: Test delegation with various gas limits, chain IDs, and nonce scenarios
• Gas estimation: Verify proper gas handling in delegation transactions

Recommended Test Plan:

1. Run the updated example_eip7702.py with SPONSOR_PRIVATE_KEY set
2. Test existing contract execution code to ensure no regressions
3. Test delegation with different wallet types and network configurations
4. Verify error handling for invalid delegation parameters

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    FunctionPy["packages/eth_rpc/src/eth_rpc/<br/>contract/function.py"]:::major-edit
    WalletPy["packages/eth_rpc/src/eth_rpc/<br/>wallet.py"]:::major-edit
    ExamplePy["example_eip7702.py"]:::minor-edit
    DelegationPy["packages/eth_rpc/src/eth_rpc/<br/>delegation.py"]:::context
    
    FunctionPy -->|"uses"| DelegationPy
    WalletPy -->|"uses"| DelegationPy
    ExamplePy -->|"demonstrates"| FunctionPy
    ExamplePy -->|"demonstrates"| WalletPy
    
    subgraph Legend
        L1[Major Edit]:::major-edit
        L2[Minor Edit]:::minor-edit
        L3[Context/No Edit]:::context
    end
    
    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB  
    classDef context fill:#FFFFFF

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Notes

• Both utility methods internally use the existing sponsor_delegation function from delegation.py
• The enhanced execute() method maintains full backward compatibility
• Also includes a separate execute_sponsored() method that provides the same functionality with explicit naming
• All changes follow existing async/sync patterns with proper type overloads
• Risk: EIP-7702 is cutting-edge functionality - thorough testing recommended

---

Link to Devin run: https://app.devin.ai/sessions/6277ae0e44924c06b7205c3842b45a38
Requested by: @talos-agent

[devin-ai-integration]

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