deprecate `preventDefault()`

[brunocrosier]

What is it?

• [x] Feature / enhancement
• [ ] Bug
• [ ] Docs / tests

Description

Instead of removing preventDefault() from the event type entirely, this will provide guidance on how to achieve the intended result by using the preventdefault:{event} attribute

Screenshot

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[zanettin]

@manucorporat may i hand this over to u?

[manucorporat]

We decided to not even include preventDefault() at all in the type! Even more strict than deprecated!