Provide a way to skip generation of certain fields

[kdichev]

The fragment generation step is very useful but my schema is very big and I don't use everything from it so I would like to skip generating some fields. Our cms graphql api is limited to a certain amount of query complexity and the generated queries for me are always too large to query from and manually fixing them is quite the task 💯

The way of setting default values for arguments is super nice way to also maybe do this?

I am happy to make the changes if it's agreed this would be useful :)

[vladar]

@kdichev Makes perfect sense to me. I was going to add something like this in the future. But I am also open to a PR. So if you're up to this, go ahead and send a PR!

Thanks for the suggestion! 💜