AudioWorklet - processorOptions are too restrictives

[b-ma]

https://webaudio.github.io/web-audio-api/#dom-audioworkletnodeoptions-processoroptions

Should support any object, i.e. "set of all possible non-null object references." cf. https://webidl.spec.whatwg.org/#idl-object

Cf. for example, example from the ringbuf.js library:

https://github.com/padenot/ringbuf.js/blob/7996bf20b3e6872d7a15da551c4e990c7f4dff94/public/example/audioworklet-to-worker/index.html#L75