tests: Add a generalized write-roundtrip test

This test tests two important invariants:

- Every combination of write flags has to result in a valid document
- Parsing that document and saving the result has to result in identical output

We don't test all flags since parse_no_escapes can intentionally result in
malformed documents and other flags aren't relevant for node output.

Also note that we test both no-whitespace and whitespace version to make sure
we don't have unnecessary whitespace added during formatting.

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