Reset relevant handler when recognizer gets reset.

[j-piasecki]

Description

At the moment reset method is only called in gestureRecognizerShouldBegin:

react-native-gesture-handler/apple/RNGestureHandler.m

Line 487 in 35ec17d

[self reset];

However, I've noticed that this method is called after some events are already sent, mainly the BEGIN event, which is often sent as soon as onTouchesBegan is executed for the first pointer.

According to the apple documentation, the reset method of recognizer is the place to reset the internal state of recognizer, which in this case in my opinion should also include the state of the handler.

The issue this fixes is the one described in #2628:

One thing that could be related is the fact that when the gesture fails before activation, the gesture stays in the Began state until the finger is lifted. This still needs to be investigated.

This was coming from the fact that the handler was failing before it was allowed to 'begin' (iOS begin not RNGH begin), so gestureRecognizerShouldBegin was not called, thus not resetting the failing handler. Because of that, it was sending events containing wrong states.

Test plan

Tested on the Example app.

[m-bert]

LGTM