[whatwg/dom] Should DOM provide guidance on garbage collection of EventTarget instances? (#1003)

For constructible interfaces that extend `EventTarget` (e.g., PermissionStatus), it might be good for the spec to provide some guidance around garbage collection. 

Two examples of where this has come up:

 * https://github.com/w3c/screen-wake-lock/pull/322
 * https://github.com/w3c/permissions/pull/256

Where we basically reusing the text from WebSocket. However, it might be possible to generalize the above into some guidance about keeping a reference global object when registering for the events supported by the object, along with some text about related task sources.  



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