chore: add msg and json file types

[ryannikolaidis]

.msg type doesn't get its mimetype resolved by mimetypes.guess_type, because of this we need an extra conditional here.

• add msg file type from filename not handled by mimetypes library
• update tests
• bonus: change test convert_files_for_api option from another_md_mimetype to use_octet_stream_type since we now need this to validate msg type files and may need for others later.

[cragwolfe]

Should there be another test for an unstructured .json payload? This is great, by the way. 🙏

[ryannikolaidis]

Should there be another test for an unstructured .json payload? This is great, by the way. 🙏

yep, I'll add that now

[cragwolfe]

@ryannikolaidis , correction: could be any .json file payload (does not need to be an "unstructured .json")

[ryannikolaidis]

@ryannikolaidis , correction: could be any .json file payload (does not need to be an "unstructured .json")

ack, just saw this. I did grab from unstructured, but happy to swap something else out.

[cragwolfe]

ack, just saw this. I did grab from unstructured, but happy to swap something else out.

no worries, the unstructured .json is also a json, so that works :)