Module/azure kinect export path of k4arecord

Tilman Daabrequested to merge
module/azure-kinect-export-path-of-k4arecord into main

While dependencies on k4a can already be resolved, dependence on k4arecord currently cannot be resolved, despite k4arecord being installed. This merge request adds the environment variable export for k4arecord.

(modification by @meixner while working on implementing .mkv playback)

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