* add internal /folder_paths route
returns a json maps of folder paths
* (minor) format download_models.py
* initial folder path input on download api
* actually, require folder_path and clean up some code
* partial tests update
* fix & logging
* also download to a tmp file not the live file
to avoid compounding errors from network failure
* update tests again
* test tweaks
* workaround the first tests blocker
* fix file handling in tests
* rewrite test for create_model_path
* minor doc fix
* avoid 'mock_directory'
use temp dir to avoid accidental fs pollution from tests
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