Emscripten: Make python.sh function as proper Python CLI

@freakboy3742

There are several problems with python.sh right now:

It doesn't work correctly on macs with bsd coreutils
It doesn't mount the native file system into the Emscripten file system, so python.sh /some/file.py will fail to find the file
It doesn't set the current directory in the Emscripten file system to the same as the host working directory so python.sh file.py won't look for file.py in the current directory
It doesn't inherit environment variables

gh-127503: Emscripten make Python.sh function as proper Python CLI (#…

pythongh-127503: Fix realpath handling in emscripten cli

pythongh-127503 Don't propagate native PATH to Emscripten Python

gh-127503 Don't propagate native PATH to Emscripten Python (#127633)

gh-127503: Fix realpath handling in emscripten cli (#127632)

pythongh-127503: Emscripten make Python.sh function as proper Python …

pythongh-127503 Don't propagate native PATH to Emscripten Python (pyt…

pythongh-127503: Fix realpath handling in emscripten cli (python#127632)

pythongh-127503: Improve tracebacks on Emscripten when there is a trap

gh-127503: Improve tracebacks on Emscripten when there is a trap (#13…

pythongh-127503: Improve tracebacks on Emscripten when there is a trap (

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