[typescript-react-query] add documentMode support

**Is your feature request related to a problem? Please describe.**

We want to preprocess the document to remove duplicated fragments. For this we created a custom version of graphql tag witch works fine. But now we want to use the react-query plugin and can not enable graphql-tags with it.

Currently typescript-react-query forces the document-mode to "string".

**Describe the solution you'd like**

typescript-react-query should be able to use the document-modes the other plugins support.

**Describe alternatives you've considered**

It would be possible to fix our problem by make grpahql-code-gen dedup the fragments before generating the document, but I have no idea yet how to do so. Another way would be to preprocess the document when its done.