feat(cli): support erc20 transfers

[tomip01]

Motivation

We want to be able to use the interface of ERC20 transfers via cli.

Description

• The transfer function in sdk/src/sdk.rs is refactored to accept an optional calldata argument and to use the provided Overrides value directly, enabling both native and ERC20 token transfers.
• The CLI transfer commands now construct ERC20 transfer transactions by encoding the transfer(address,uint256) calldata when a token address is provided, and set the transfer value to zero.