feat: add layout and screenLayout props for screens

[satya164]

Motivation

This adds a new layout prop that can be used to wrap screens.

It makes it easier to provide things such as a global error boundary and suspense fallback for a group of screens without having to manually add HOCs for every screen separately.

See #11152

Usage:

<Stack.Screen
  name="MyScreen"
  component={MyScreenComponent}
  layout={({ children }) => (
    <ErrorBoundary>
      <React.Suspense
        fallback={
          <View style={styles.fallback}>
            <Text style={styles.text}>Loading…</Text>
          </View>
        }
      >
        {children}
      </React.Suspense>
    </ErrorBoundary>
  )}
/>

Or in group/navigator

<Stack.Group
  screenLayout={({ children }) => (
    <ErrorBoundary>
      <React.Suspense
        fallback={
          <View style={styles.fallback}>
            <Text style={styles.text}>Loading…</Text>
          </View>
        }
      >
        {children}
      </React.Suspense>
    </ErrorBoundary>
  )}>
  {/* screens */}
</Stack.Group>

Test plan

This adds unit tests for testing, as well as a demo screen in the example app showing error boundary and suspense using the layout prop.

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2023-12-11.at.01.16.58.mp4

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad7c703) 75.98% compared to head (ef2dd73) 76.01%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11741      +/-   ##
==========================================
+ Coverage   75.98%   76.01%   +0.02%     
==========================================
  Files         207      207              
  Lines        6080     6087       +7     
  Branches     2362     2367       +5     
==========================================
+ Hits         4620     4627       +7     
  Misses       1407     1407              
  Partials       53       53              

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[github-actions]

The Expo app for the example from this branch is ready!

https://expo.dev/@react-navigation/react-navigation-example?serviceType=eas&distribution=expo-go&scheme=exp+react-navigation-example&channel=pr-11741&sdkVersion=49.0.0

[osdnk]

looks reasonable