Show inheritance of contracts

[Julius278]

Feature description_

in Web3J Java wrapper classes it would help to see, from which contract / wrapper class the wrapped contract inherits (extends, implements).

Or the other way around: You are able to load an implemented contract by loading the abstract contract like: Interface.load(contractAddress, ...) but what you load is the implemented contract. Here it would be good to have a method to query the name of the implemented contract. Otherwise it could be any kind of implementation of the interface or abstract contract.