feat: add chunking_strategy kwarg

[Coniferish]

Add chunking_strategy as a kwarg for parsing and associated test.

Testing

curl -X 'POST' 'http://127.0.0.1:8000/general/v0/general' \
 -H 'accept: application/json'  \
 -H 'Content-Type: multipart/form-data' \
 -F 'files=@sample-docs/layout-parser-paper-fast.pdf' \
 -F 'chunking_strategy=by_title' \
 | jq -C . | less -R

[awalker4]

Looks good! Can you start a new version in the CHANGELOG? You'll need to run make version-sync once that's updated.

[awalker4]

LGTM!