fix: ensure tuple arguments are encoded as tuples

[mattsse]

Motivation

• single solidity struct arguments resulted in an invalid type check when encoding the function parameters, such as

 function addLiquidityEthForUniV3(CellarAddParams calldata cellarParams)

Solution

• Modify the generated function body so that tuples are treated as tuples when encode_function_data is invoked internally

[zmanian]

This is test fixes the invoking a contract calls with tuple args for me.