Feature/asyncify contract

[dbfreem]

More AsyncContract

Set default contract factory to AsyncContract in AsyncEth

Unfortunately, this required copy and pasting those three contract functions and the property from the BaseEth class to the Eth and AsyncEth classes

[dbfreem]

@ChristianCoenen this is a change that should fix what you reported in #2394. Let me know what you think.

@pacrob Setting the defaultContractFactory to AsyncContract in AsyncEth

[ChristianCoenen]

Thanks, lgtm!

Unfortunately, this required copy and pasting those three contract functions and the property from the BaseEth class to the Eth and AsyncEth classes

Was there a reason for this like failing tests or some edge cases? Wouldn't just adding

defaultContractFactory: Type[Union[AsyncContract, AsyncContractCaller]] = AsyncContract

to AsyncEth be sufficient? That's what I did temporarily to make my code work.

[dbfreem]

@ChristianCoenen I don't know what happened but when I made the change you suggested it broke some test. To be honest I didn't look into it and just moved the methods down to AsyncEth and Eth. It was probably something simple I did.

I read your message above and thought "yea that should have worked" and it did when I made the changes you suggested again this evening. So I am opening another PR to revert some of those changes I made last night and implement your suggestion.

Thanks so much for looking into this!