Bazel builds should be hermetic, but they're not

[mhucka]

Describe the issue

The Bazel configuration files do no install the Python requirements, which means it's up to the user to do pip install requirements.txt and dev-requirements.txt prior to running Bazel commands. If they don't, they may get an unobvious error message such as this:

ERROR: Analysis of target '//tests:simulator_testfixture' failed; build aborted: Problem getting numpy include path.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'

We need to make qsim's Bazel files use rules_python and install the Python requirements.

What version of qsim are you using?

0.22.0.dev0

How can the issue be reproduced?

No response