spack python: add -m option to run modules as scripts

It's often useful to run a module with `python -m`, e.g.:

    python -m pyinstrument script.py

Running a python script this way was hard, though, as `spack python` did
not have a similar `-m` option.  This PR adds a `-m` option to `spack
python` so that we can do things like this:

    spack python -m pyinstrument ./test.py

This makes it easy to write a script that uses a small part of Spack and
then profile it.  Previously thee easiest way to do this was to write a
custom Spack command, which is often overkill.

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