feature: allow on: event listeners on <Component/> nodes

[gbj]

No description provided.

[ModProg]

One thing that I noticed is, that if you register an event listener on a component that will override the internal event listener if they happen to apply to the same element:

Component = <input on:input= |_| do_some_thing()/>
Callsite: <Component on:input=|_| do_some_thing_else()/>

do_some_thing will never be called, but:

Component = <div><input on:input= |_| do_some_thing()/></div>
Callsite: <Component on:input=|_| do_some_thing_else()/>

works as expected, and both do_some_thing and do_some_thing_else are called.

[gbj]

Yeah that makes sense to me, as I don't think we currently support adding multiple of the same event listener:
<input on:input= |_| do_some_thing() on:input=|_| do_some_other_thing()/>

Maybe we should -- if this would be helpful for your use case you could open a feature request issue to be able to add multiple event listeners of the same type to an element.

Components don't "exist" in any sense, so there's nothing to attach a listener to other than the elements.