Apply notification icon settings of FCM on Android (#3113)

Co-authored-by: Hailey <me@haileyok.com>

plugins/withAndroidManifestFCMIconPlugin.js

@@ -0,0 +1,37 @@
+const {withAndroidManifest} = require('expo/config-plugins')
+
+module.exports = function withAndroidManifestFCMIconPlugin(appConfig) {
+  return withAndroidManifest(appConfig, function (decoratedAppConfig) {
+    try {
+      function addOrModifyMetaData(metaData, name, resource) {
+        const elem = metaData.find(elem => elem.$['android:name'] === name)
+        if (elem === undefined) {
+          metaData.push({
+            $: {
+              'android:name': name,
+              'android:resource': resource,
+            },
+          })
+        } else {
+          elem.$['android:resource'] = resource
+        }
+      }
+      const androidManifest = decoratedAppConfig.modResults.manifest
+      const metaData = androidManifest.application[0]['meta-data']
+      addOrModifyMetaData(
+        metaData,
+        'com.google.firebase.messaging.default_notification_color',
+        '@color/notification_icon_color',
+      )
+      addOrModifyMetaData(
+        metaData,
+        'com.google.firebase.messaging.default_notification_icon',
+        '@drawable/notification_icon',
+      )
+      return decoratedAppConfig
+    } catch (e) {
+      console.error(`withAndroidManifestFCMIconPlugin failed`, e)
+    }
+    return decoratedAppConfig
+  })
+}