Don't require a system-installed Python interpreter for bootstrapping

[brandjon]

Forked from discussion in #7947. On windows, we can have the native launcher take on the responsibilities of the stub script, in particular extracting the runfiles. This means it can use any Python runtime to launch the user code, including a runtime in runfiles.

We should also consider creating a native launcher for non-Windows platforms to do the same, so we don't need the #!/usr/bin/env python shebang.

Finally, we can consider merging the zip file into the launch to create a self-extracting native executable.

[laszlocsomor]

/cc @laszlocsomor

[abergmeier]

We should also consider creating a native launcher for non-Windows platforms to do the same, so we don't need the #!/usr/bin/env python shebang.

Can you write up a proposal for goals and rough ideas?

[neilisaac]

Just a though about the python (or a future native) wrapper: it would be much nicer if bazel run/test would invoke the correct interpreter directly, passing PYTHONPATH as an env var instead of using execv to replace the wrapper process.

I would like to be able to easily wrap --run_under=... to run tools like cProfile or pdb without having to hack wrapper scripts to inject them.

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