Be able to deduce the size of a function's return payload thanks to the signature parsed in the compiled JSON contract file

[Eikix]

Depends on #98

Tim: En déduire la taille du payload de return de chaque fonction moquée

end goal:
mock_call(name_of_my_func, [42, “shortstring”, ids.myVarName, Uint256 {high: 42, low: 0x0}])

[ptisserand]

Can I work on this issue?