Replace test app with react-native-test-app

[Saadnajmi]

DRAFT, DO NOT MERGE (Figured I'd throw up my WIP branch anyway)

In order to help maintenance and improve support for new out of tree platforms (like macOS and visionOS), let's replace the test app with https://github.com/microsoft/react-native-test-app . This simplifies the native code needed to stand up the example apps. In the case of apple platforms, it's now a single pod-sec.

TODO:

• I had to port some of the manual resolving of the node module three/webgu, particularly in metro.config.js. We should double check that before merge.

• I am still getting the following error with the latest set of my changes when I try to load from dev server:

 BUNDLE  ./index.js 

 LOG  Running "Example" with {"rootTag":61,"initialProps":{}}
 ERROR  Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'WebGPUModule' could not be found. Verify that a module by this name is registered in the native binary.Bridgeless mode: false. TurboModule interop: false. Modules loaded: {"NativeModules":["PlatformConstants","LogBox","Timing","AppState","SourceCode","BlobModule","WebSocketModule","SettingsManager","DevSettings","RedBox","Networking","Appearance","DevLoadingView","UIManager","DeviceInfo","ImageLoader","LinkingManager"],"TurboModules":[],"NotFound":["NativePerformanceCxx","NativePerformanceObserverCxx","BugReporting","HeadlessJsTaskSupport","SoundManager","IntentAndroid","WebGPUModule"]} 
loadModuleImplementation@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:267:14
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
AppContainer@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63548:25
Example(RootComponent)@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:117637:28
 ERROR  Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'WebGPUModule' could not be found. Verify that a module by this name is registered in the native binary.Bridgeless mode: false. TurboModule interop: false. Modules loaded: {"NativeModules":["PlatformConstants","LogBox","Timing","AppState","SourceCode","BlobModule","WebSocketModule","SettingsManager","DevSettings","RedBox","Networking","Appearance","DevLoadingView","UIManager","DeviceInfo","ImageLoader","LinkingManager"],"TurboModules":[],"NotFound":["NativePerformanceCxx","NativePerformanceObserverCxx","BugReporting","HeadlessJsTaskSupport","SoundManager","IntentAndroid","WebGPUModule"]} 
@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:62466:47
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
AppContainer@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63548:25
Example(RootComponent)@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:117637:28
 ERROR  Invariant Violation: TurboModuleRegistry.getEnforcing(...): 'WebGPUModule' could not be found. Verify that a module by this name is registered in the native binary.Bridgeless mode: false. TurboModule interop: false. Modules loaded: {"NativeModules":["PlatformConstants","LogBox","Timing","AppState","SourceCode","BlobModule","WebSocketModule","SettingsManager","DevSettings","RedBox","Networking","Appearance","DevLoadingView","UIManager","DeviceInfo","ImageLoader","LinkingManager"],"TurboModules":[],"NotFound":["NativePerformanceCxx","NativePerformanceObserverCxx","BugReporting","HeadlessJsTaskSupport","SoundManager","IntentAndroid","WebGPUModule"]} 
mountIndeterminateComponent@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:100209:34
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
RCTView
View@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63675:43
AppContainer@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:63548:25
Example(RootComponent)@http://localhost:8081/index.bundle//&platform=ios&dev=true&lazy=true&minify=false&inlineSourceMap=false&modulesOnly=false&runModule=true&app=com.microsoft.ReactTestApp:117637:28
 ERROR  TypeError: undefined is not an object (evaluating '_$$_REQUIRE(_dependencyMap[3], "./components/useAssets").useAssets')

This error is located at:
    in App
    in RCTView (created by View)
    in View (created by AppContainer)
    in RCTView (created by View)
    in View (created by AppContainer)
    in AppContainer
    in Example(RootComponent)
 ERROR  TypeError: undefined is not an object (evaluating '_$$_REQUIRE(_dependencyMap[3], "./components/useAssets").useAssets')

This error is located at:
    in App
    in RCTView (created by View)
    in View (created by AppContainer)
    in RCTView (created by View)
    in View (created by AppContainer)
    in AppContainer
    in Example(RootComponent)

[wcandillon]

sounds interesting 😇

[Saadnajmi]

Closing mine to replace with #120