Add support for MIDI device recording with real time metronome

Your idea

I would like to have a real time metronome when writing notes registered via MIDI keyboard. The metronome should provide an option to configure its tempo, which will determine the the smallest note that can be sampled on key press.

Example: considering the metronome to be configured with a sampling rate of 1/8. If a key press is greater than 1/4 but less than 3/8, the resulting note would be 1/4.

Problem to be solved

This feature request can be seen as an extension/improvement of the existing midi input functionality.

The problem with the actual input method is that it is too slow for quickly input notes with different durations. It is usually way faster to have the music notation software try to detect notes and rests duration based on the metronome and then clean up the sheet from the ones that have not been sampled correctly.

Prior art

Other proprietary music notation software like Sibelius provide this feature in their free version.

Additional context

No response

Begin by reviewing the existing MIDI input functionality referenced in the issue and the surrounding MuseScore implementation. Establish how MIDI key-press durations are currently recorded, then define and test configurable metronome-based quantization for notes and rests; the issue provides no file or test path, so code locations must first be identified.