Wanted: Ability to force-export fragments in generatedTypes

[fbruckhoff]

In our codebase generatedTypes.ts includes some useful fragments that are not being exported. I believe these are fragments that aren't defined manually in a .gql file and are auto-generated based on other fragment definitions, specifically some that use ... on SomethingElse in their body, resulting in non-exported fragments like Something_SomethingElse_Fragment.

It would be really cool if there was a way to force codegen to export these as well.