Support for Codegen

[collegeimprovements]

Thanks a lot for absinthe_client. We've been waiting for it for a long time.
One of the main issue with consuming any graphql api(our or 3rd party) is it can change.
We can use different codegen libraries to ensure that the code that we are using is not out of date in js/ts world.
We have artem in elixir world.

Would a codegen be within the scope of this project ? If yes, it would be quality of life addition 😊.
This can be very handy tool when our whole ui is just live_view and have almost zero js/ts.

Thanks again for open-sourcing absinthe_client.