Use arbigen bindings without a provider

[joleeee]

Is it possible to encode and decode contracts calls using bindings generated with abigen, but without actually instantiating them?

I know you can use the MYCONTRACT_ABI.function("myFunction"), and then decode/encode on that, but that's quite ugly, unergonomic and error-prone.

I'd be interested in submitting a PR myself but i wanna make sure there isn't some way that I've missed.