Hotkeys and static transcription test implementation

[homelab-00]

I modified the realtimestt_test.py and added live typing, hotkeys and static transcription. Works well enough in my system but do give it test. Shortcuts are global and suppressed.

• F1 mutes the microphone (script starts unmuted)
• F2 unmutes the microphone (Note that mute/unmute refers only to the live transcription. Static transcription happens only on-demand when pressing F3.)
• F3 starts static audio recording
• F4 stops static audio recording
• F5 resets transcription (works for both live and static) Useful for flushing a sentence when you know you want to say something differently but don't want to wait for the script to finish transcribing and to only then delete it manually with Backspace.

[KoljaB]

Looks cool, thanks a lot