near-operation-file that creates a file per operation

[AaronBuxbaum]

Right now, near-operation-file creates a file per source file (src/__generated__/mutations.ts). However, Apollo codegen created a file per operation (src/__generated__/MyMutation.ts; src/__generated__/AnotherMutation.ts; ...)

While I think that near-operation-file has the correct settings, it would be a tremendous amount of work to migrate all of my code to the updated operations -- even worse, slight differences between Apollo generation and codegen generation means that we effectively have to move over all operations all at the same time for Typescript to pass. If we had a way to generate a file per GraphQL operation, it would allow a much easier transition, and then we could iterate on top of that change to move to the more correct per-file approach.