USB device add/remove callbacks

[puddly]

Proposed change

#130918 is required to test this on macOS.

Background: I would like the SkyConnect integration to unload itself when the SkyConnect becomes unplugged. Current integrations take control of the serial port and react to the disconnect but the SkyConnect integration cannot do this, as it only passively monitors the state of the device.

To implement this, we keep track of the results of the previous device scan and compare it to the new one, reacting now to the remove udev event in addition to the add event. Registered callbacks are called with two sets as arguments: added devices and removed devices.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @bdraco, mind taking a look at this pull request as it has been labeled with an integration (usb) you are listed as a code owner for? Thanks!

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