Adds `external-cache-path`

android/src/main/res/xml/fluwx_file_provider_paths.xml

 <?xml version="1.0" encoding="utf-8"?>
 <paths xmlns:android="http://schemas.android.com/apk/res/android">
-    <cache-path name="fluwxSharedData" path="fluwxSharedData/"/>
-</paths>
\ No newline at end of file
+    <cache-path name="fluwxSharedData" path="fluwxSharedData/" />
+    <external-cache-path name="externalFluwxSharedData" path="fluwxSharedData/" />
+</paths>