Module registration and loading for Android (#33)

* Initialize Android test app

* Add scaffold for Android TurboModule loader

* Move vendoring of Hermes into a shared CLI command

* WIP on the Android TurboModule

* Add Android triplets

* Build with NDK

Author: kraenhansen

apps/test-app/.watchmanconfig

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+{}

apps/test-app/android/build.gradle

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+buildscript {
+    apply(from: {
+        def searchDir = rootDir.toPath()
+        do {
+            def p = searchDir.resolve("node_modules/react-native-test-app/android/dependencies.gradle")
+            if (p.toFile().exists()) {
+                return p.toRealPath().toString()
+            }
+        } while (searchDir = searchDir.getParent())
+        throw new GradleException("Could not find `react-native-test-app`");
+    }())
+
+    repositories {
+        mavenCentral()
+        google()
+    }
+
+    dependencies {
+        getReactNativeDependencies().each { dependency ->
+            classpath(dependency)
+        }
+    }
+}
+
+allprojects {
+    repositories {
+        {
+            def searchDir = rootDir.toPath()
+            do {
+                def p = searchDir.resolve("node_modules/react-native/android")
+                if (p.toFile().exists()) {
+                    maven {
+                        url(p.toRealPath().toString())
+                    }
+                    break
+                }
+            } while (searchDir = searchDir.getParent())
+            // As of 0.80, React Native is no longer installed from npm
+        }()
+        mavenCentral()
+        google()
+    }
+}

apps/test-app/android/gradle.properties

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+# Project-wide Gradle settings.
+
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+
+# Specifies the JVM arguments used for the Gradle Daemon. The setting is
+# particularly useful for configuring JVM memory settings for build performance.
+# This does not affect the JVM settings for the Gradle client VM.
+# The default is `-Xmx512m -XX:MaxMetaspaceSize=256m`.
+org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
+
+# When configured, Gradle will fork up to org.gradle.workers.max JVMs to execute
+# projects in parallel. To learn more about parallel task execution, see the
+# section on Gradle build performance:
+# https://docs.gradle.org/current/userguide/performance.html#parallel_execution.
+# Default is `false`.
+#org.gradle.parallel=true
+
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+#android.enableJetifier=true
+# Jetifier randomly fails on these libraries
+#android.jetifier.ignorelist=hermes-android,react-android
+
+# Use this property to specify which architecture you want to build.
+# You can also override it from the CLI using
+# ./gradlew <task> -PreactNativeArchitectures=x86_64
+reactNativeArchitectures=armeabi-v7a,arm64-v8a,x86,x86_64
+
+# Use this property to enable support to the new architecture.
+# This will allow you to use TurboModules and the Fabric render in
+# your application. You should enable this flag either if you want
+# to write custom TurboModules/Fabric components OR use libraries that
+# are providing them.
+# Note that this is incompatible with web debugging.
+newArchEnabled=true
+#bridgelessEnabled=true
+
+# Uncomment the line below to build React Native from source.
+react.buildFromSource=true
+
+# Version of Android NDK to build against.
+#ANDROID_NDK_VERSION=26.1.10909125
+
+# Version of Kotlin to build against.
+#KOTLIN_VERSION=1.8.22

apps/test-app/android/gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists