Supporting ethers human-readable ABIs

[koredefashokun]

Hello. Great work on this library. It's very simple and easy to use.

I'm currently in the process of switching one of the projects I work on to using ethers' Human Readable ABI format, as opposed to the standard ABI format, particularly because of the readability, as well as the (minimal) bundle size savings we can get from doing that (we have a lot of ABI's in the frontend code). However, since ethcall (to my understanding) does not support this, we still have to keep the regular ABIs around for the contracts we use ethcall on.

I was wondering if adding support for this was on the roadmap. If so, I would love to open a PR that does this.

That said, I completely understand if you would like to keep this library as-is, and not introduce more complexity.