Add support for android meta-data

{{cookiecutter.out_dir}}/android/app/src/main/AndroidManifest.xml

@@ -12,9 +12,9 @@
         android:name="${applicationName}"
         android:enableOnBackInvokedCallback="true"
         android:icon="@mipmap/ic_launcher">
-        <meta-data
+        <!-- flet: meta-data {% for k, v in cookiecutter.options.android_meta_data.items() %} -->
-            android:name="io.flutter.embedding.android.EnableImpeller"
+        <meta-data android:name="{{ k }}" android:value="{{ v }}" />
-            android:value="false" />
+        <!-- flet: end of meta-data {% endfor %} -->
         <activity
             android:name=".MainActivity"
             android:exported="true"