Fix race condition between the orchestrator and the registry

[j-piasecki]

Description

Should fix #1639

The IndexOutOfBoundsException was thrown at line 387:

react-native-gesture-handler/android/lib/src/main/java/com/swmansion/gesturehandler/GestureHandlerOrchestrator.java

Lines 383 to 388 in 0343428

	ArrayList<GestureHandler> handlers = mHandlerRegistry.getHandlersForView(view);
	boolean found = false;
	if (handlers != null) {
	for (int i = 0, size = handlers.size(); i < size; i++) {
	GestureHandler handler = handlers.get(i);
	if (handler.isEnabled() && handler.isWithinBounds(view, coords[0], coords[1])) {

So the handlers collection must have been modified in other place and the registry is the only class that modifies it. My guess is that the handler was dropped or removed from view and relevant method was called (asynchronously)
causing the list to be modified while it was being iterated over. This PR locks the list while it's being modified or iterated over.

Test plan

I couldn't reproduce the issue, but I tested the changes on the Example app and it works correctly.