Show event listeners in EventTargets

[Jason Laster]

CC http://github.com/devtools-html/debugger.html/issues/4751

If a value in the watch/variable view is an EventTarget, it would be nice to be able to expose the event listeners on it.

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I think we can do this by showing a field in the Reps element view.

[Nicolas Chevobbe]

See https://bugzilla.mozilla.org/show_bug.cgi?id=1419089

[Nicolas Chevobbe]

This issue was moved to firefox-devtools/debugger#6116