add missing __init__.py to models package

[jtriley]

The current v0.12.0 release is getting the following error during testing:

coldfront-deployment-f9c5d795f-fqqfh coldfront   File "/opt/venv/lib/python3.12/site-packages/coldfront_plugin_cloud/base.py", line 10, in <module>
coldfront-deployment-f9c5d795f-fqqfh coldfront     from coldfront_plugin_cloud.models.quota_models import QuotaSpecs
coldfront-deployment-f9c5d795f-fqqfh coldfront ModuleNotFoundError: No module named 'coldfront_plugin_cloud.models'
coldfront-deployment-f9c5d795f-fqqfh coldfront No module named 'coldfront_plugin_cloud.models'

This is likely due to the models package being left out of the final build due to __init__.py missing.

[jtriley]

Just confirming this fixes the issue.

$ pip install git+https://github.com/nerc-project/coldfront-plugin-cloud@a86b593a231e0ac8d6e33e552cbd4985bc5ec814
$ pip show -f coldfront_plugin_cloud | grep -i models
  coldfront_plugin_cloud/models/__init__.py
  coldfront_plugin_cloud/models/__pycache__/__init__.cpython-314.pyc
  coldfront_plugin_cloud/models/__pycache__/quota_models.cpython-314.pyc
  coldfront_plugin_cloud/models/__pycache__/usage_models.cpython-314.pyc
  coldfront_plugin_cloud/models/quota_models.py
  coldfront_plugin_cloud/models/usage_models.py
  coldfront_plugin_cloud/tests/unit/__pycache__/test_usage_models.cpython-314.pyc
  coldfront_plugin_cloud/tests/unit/test_usage_models.py