Add an ability to have custom preview

[desfero]

This PR adds an ability to pass custom implementation of the preview component.

Simulator.Screen.Recording.-.iPhone.14.-.2023-06-23.at.16.34.11.mp4

TODO:

• Cleanup the code
• Document the changes
• Understand the best way to have nice animation of reactions once it's hiding from the view.

[NoodleOfDeath]

OHHH I LIKE THIS!! I was trying to add some kind of 'willOpen' property but it needs be synchronously awaited before calculating the size of the component

[desfero]

Don't have time to fully finish this one in the short term future, if anyone wants to continue let me know.

[fukemy]

hi all, I just want to ask a question:

I saw the lib render {children} 2 times like this:

<GestureHandler>
        <Animated.View ref={containerRef} style={containerStyle}>
          {children} => HERE
        </Animated.View>
      </GestureHandler>

      <Portal key={key} name={key}>
        <Animated.View
          key={key}
          style={portalContainerStyle}
          animatedProps={animatedPortalProps}
        >
          <PortalOverlay />
          {children} => HERE
        </Animated.View>
      </Portal>

So does performance better?