jupytext: Initial Project Proposal (#12581)

I am requesting permission to integrate
[jupytext](https://github.com/mwouts/jupytext) into OSS-Fuzz. I believe
that this project is a good candidate for OSS-Fuzz integration. It is a
Python package that provides two-way conversion between Jupyter
notebooks and several other text-based formats like Markdown documents
or scripts. It is used by over 8,000 repositories and 340 packages. Most
notably, google/flax (6k+ stars), Azure/PyRIT (1.8k+ stars), scipy/scipy
(13k+ stars), ploomber (3.5k+ stars) and jupyter-book (3.8k+ stars)

Please see upstream approval for integration:
mwouts/jupytext#1236

Co-authored-by: Vitor Guidi <[email protected]>

projects/jupytext/project.yaml

@@ -0,0 +1,11 @@
+homepage: "https://jupytext.readthedocs.io/en/latest/developing.html"
+language: python
+primary_contact: "[email protected]"
+auto_ccs: 
+  - "[email protected]"
+fuzzing_engines: 
+  - libfuzzer
+sanitizers: 
+  - address
+  - undefined
+main_repo: "https://github.com/mwouts/jupytext.git"