Is your feature request related to a problem? Please describe.
Active Sensing is disabled by default, requiring users who want to use it to have to download the source code, modify it, and install it manually.

Describe the solution you'd like
Active Sensing is the built-in method for ensuring that a "master" MIDI device knows that a connected MIDI device is still connected. Using Active Sensing messages should be the way to check on a connected device's "health."

Describe alternatives you've considered
I built a ping system using MIDI Note On and Note Off messages, but that is a hack at best, and not how Note On and Note Off messages are supposed to be used. It makes it impossible for those notes to be used in any other way. Since Active Sensing is meant to be used for this exact purpose, using other MIDI messages is bad practice.

Additional context
See https://github.com/orgs/mido/discussions/405.