feat(crashlytics): add firebase.json support for NDK crash reporting

packages/crashlytics/android/build.gradle

@@ -57,6 +57,20 @@ project.ext {
   ])
 }
 
+apply from: file('./../../app/android/firebase-json.gradle')
+
+// Default to 'false' for the feature due to memory usage concerns
+String crashlyticsNdkEnabled = 'false'
+
+if (rootProject.ext && rootProject.ext.firebaseJson) {
+  def rnfbConfig = rootProject.ext.firebaseJson
+
+  // Allow users to opt-in to NDK crash reporting (or whatever feature)
+  if (rnfbConfig.isFlagEnabled('crashlytics_ndk_enabled', false) == true) {
+    crashlyticsNdkEnabled = 'true'
+  }
+}
+
 android {
   def agpVersion = Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0].toInteger()
   if (agpVersion >= 7) {
@@ -65,6 +79,9 @@ android {
 
   defaultConfig {
     multiDexEnabled = true
+    manifestPlaceholders = [
+      firebaseJsonCrashlyticsNdkEnabled: crashlyticsNdkEnabled
+    ]
   }
 
   buildFeatures {

packages/crashlytics/android/src/main/AndroidManifest.xml

@@ -6,6 +6,18 @@
     <meta-data
       android:name="firebase_crashlytics_collection_enabled"
       android:value="false" />
+
+    <!-- NDK crash reporting - disabled by default due to memory impact -->
+    <!-- Example (in Firebase.json): {
+        "react-native": {
+          "crashlytics_ndk_enabled": true
+        }
+      }
+    -->
+    <meta-data
+      android:name="firebase_crashlytics_ndk_enabled"
+      android:value="${firebaseJsonCrashlyticsNdkEnabled}" />
+
     <provider
       android:name="io.invertase.firebase.crashlytics.ReactNativeFirebaseCrashlyticsInitProvider"
       android:authorities="${applicationId}.reactnativefirebasecrashlyticsinitprovider"