Make stylusData property of the GestureUpdateEvent optional

[kkafar]

Description

Idk what's your policy on types & whether the type stylusData: StylusData | undefined type is intended in this form or not,
but currently when creating event of type GestureUpdateEvent<PanGestureHandlerEventPayload> user is forced to specify
stylusData even if there is none - in such case stylusData: undefined must be passed; the prop can not be just simply omitted.

I'm humbly suggesting that you consider relaxing these types a bit to stylusData?: StylusData | undefined, so that it
does not have to be always specified.

Context: this is just quality of life improvement IMO, not crucial. I've stubmled upon this when I've bumped version of gesture-handler in react-native-screens (link)

• current types forced me to add this field, and I've thought this is not pleasant.

Test plan

N/A, every thing should work as before

[kkafar]

Note: it is possible that the type should be adjusted in few other places to account for this change. I'll update the code once you confirm that you would agree for such change; otherwise I don't want to spend time on it 😄

[latekvo]

Sounds good, I think we can remove | undefined now, since it's redundant.

Suggested change

	stylusData?: StylusData | undefined;
	stylusData?: StylusData;