python module: move the introspection script into an external script

We write this out as an embedded string to a tempfile in order to run
it, which is pretty awkward. And usually Meson's files are already files
on disk, not packed into a zip, so we can simply run it directly. Since
python 3.7, which is our new minimum, we can handle this well via the
stdlib. (There's also mesonbuild.mesondata, but we do not need
persistence in the builddir.)

This also solves the problem that has always been there, of giant python
programs inside strings occasionally confusing syntax highlighters. Or
even, it would be nice if we had syntax highlighting for this
introspection program. :D

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