Feature request: Option for keyword-only constructor in `make_init` and friends

[burnpanck]

Usually, I prefer dataclass-like objects to have keyword-only __init__. In general, I believe that invocations with more than one or two positional arguments are a risk to refactoring and make the code harder to read. and dataclasses with just one or two fields seem to defeat the purpose.

[smarie]

This is a nice suggestion @burnpanck ! It could even be made the default, as it makes sense.

Would you like to give a shot at a PR ? Otherwise I'll have a look when time allows

[burnpanck]

I am really just starting to use pyfields, so at this point I haven't felt the calling for a PR yet. That might change once I've used pyfields more seriously though.

[smarie]

Ok, thanks for the feedback ! Let me know.