ENH: Always compile python scripts as legacy .pyc files

[jcfr]

Refine the script introduced in commit db3f4d99 ("Re-create python compile script only if needed and fix dependency. See #449", 2014-04-16) by explicitly specifying the cfile parameter. Disable the default behavior (introduced in Python 3.2) of generating .pyc files in the __pycache__ directory, as outlined in PEP-3147.

This improvement is needed for Slicer-based applications, enabling them to locate scripted modules and plugins as either .py or .pyc files in a specific directory.

References:

• PEP-3147: https://peps.python.org/pep-3147/
• Slicer Forum Discussion: https://discourse.slicer.org/t/how-to-hide-the-code-of-the-script-module/26135/14
• Python Documentation: https://docs.python.org/3/library/py_compile.html#py_compile.compile

[jcfr]

Thanks for the review.

@jamesobutler @lassoan Any suggestions before we move forward with the integration?