Proposal to Use `__events__` instead of `register_event_type`

[kengoon]

Description of the Feature

So kivy has two ways for registering an event, one way is to use register_event_type method, which involves calling this method at the __init__ level. But there's a drawback on this approach; this does not allow binding an event during when an object is created. Example code of binding an event object during object creation, assuming on_fire to be the event:

Object(height=2, on_fire=self.fire)

But with the current implementation of event registering in kivymd, you get to write two lines of code

obj = Object(height=2)
obj.bind(on_fire=self.fire)

A quick fix for this while using register_event_type would be to call register_event_type before super
Example code:

class Object(Widget):
    def __init__(self, **kwargs):
        self.register_event_type("on_fire")
        super().__init__(**kwargs)

    def on_fire(self):
        pass

A more cleaner fix would be

class Object(Widget):
    __events__ = ("on_fire",)
    
    def on_fire(self):
        pass

[HeaTTheatR]

Thanks, let's check it out!