Add support for abort signals when calling on and once

[pleek91]

Description

When stopping event handlers its often useful to be able to stop multiple listeners at the same time. By adding support for abort signals multiple handlers can be stopped at once without having to call multiple off callbacks.

const controller = new AbortController()

emitter.on(globalHandler, { signal: controller.signal })
emitter.on('eventOne', eventOneHandler, { signal: controller.signal })
emitter.on('eventTwo', eventTwoHandler, { signal: controller.signal })

controller.abort()

Note: I also organized some test coverage and added some missing test cases to unify testing around on, once, and next`

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[stackoverfloweth]

very nice 👏

got a few small code suggestions but nothing I feel super strongly about