ensures python site package directory exists

[deadc0de6]

This PR ensures the first entry in the python site packages is created.
This avoids issues when, for some reason, the first directory of site.getsitepackages() does not exist.

[CLAassistant]

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[xusheng6]

I have approved this PR. Looks good to me, though Jordan brought up some concerns that the sitepackages may not be writable anyways. However, it seem to me that in the case of a pipenv, etc, the site.getsitepackages will return a unique path for each environment, which is also often times writable. If we use getusersitepackages, then it will actually always return the same path, which does not consider the presence a pipenv. Here is some output that could help explain this:

(Running inside pipenv)

>>> site.getsitepackages()
['/Users/xusheng/.local/share/virtualenvs/xusheng-2ZPXY7r0/lib/python3.11/site-packages']
>>> site.getusersitepackages()
'/Users/xusheng/Library/Python/3.11/lib/python/site-packages'