Add options to minify document (query) when using documentMode String.

**Is your feature request related to a problem? Please describe.**
graphql has a utility function `stripIgnoredCharacters` that will effectively minify any string document. This could help with code size when strings representing queries are embedded in the source.

**Describe the solution you'd like**
I would like a config option that will run `stripIgnoredCharacters` right after `print` on documents.

**Describe alternatives you've considered**
None

**Additional context**
Thanks for this awesome suite of tools!