Consider packaging python dependencies for Speech-to-Text functionality

Description:

Kdenlive uses 3rd party python packages to provides its Speech-to-Text functionality.

The package in Arch currently only mentions python as an optional dependency ("for scripts") but non of the other python dependencies. The app detects if those pip packages are available and lets you install them by running pip into system location or into a custom venv location somewhere below the home dir.

I think it would be great to have those dependencies managed by Arch as optional dependencies for this feature.

Additional info:

You can find the necessary python packages in kdenlive in data/scripts/requirements-*.txt

kdenlive-speech-to-text

Steps to reproduce:

Thank you for always keeping this package up-to-date!