feat: add return value for transactions

Overview

Provide a simple overview of what you wish to see added. Please include:

Upon making a test for ERC20 Smart contract. We should add a return value for accounts.

tx = contract.myMutableMethod(...)
assert tx.return_value == ...  # .return_value doesn't exist

• What you are trying to do
• Why Ape’s current functionality is inadequate to address your goal

Specification

Describe the syntax and semantics of how you would like to see this feature implemented. The more detailed the better!

Remember, your feature is much more likely to be included if it does not involve any breaking changes.

Dependencies

Include links to any open issues that must be resolved before this feature can be implemented.

[banteg]

this can be quite easily done now

def get_return_value(tx):
    call_tree = chain.provider.get_call_tree(tx)
    method_abi = Contract(call_tree.address).contract_type.mutable_methods[call_tree.calldata]
    output = chain.provider.network.ecosystem.decode_returndata(method_abi, call_tree.returndata)
    if isinstance(output, tuple) and len(output) < 2:
        output = output[0] if len(output) == 1 else None
    return output

[fubuloubu]

@helloibis might be able to take a stab at adding this to the ReceiptAPI class as a .return_value property, and let it raise if the current provider does not implement .get_call_tree