feat: support `access.addEventListener('statechange')`

[arnoson]

Right now only setting the onstatechange property is supported

const access = await navigator.requestMIDIAccess()
access.onstatechange = () => {}

But the Web Midi API also allows using an event listener:

const access = await navigator.requestMIDIAccess()
access.addEventListener('statechange', () => {})

This can be useful if you want to have multiple listeners for the statechange event.