Support Android's default native symbol zip format

[mmarczell-graphisoft]

The Android build system now has builtin support for exporting native symbols, which can be used to get symbolication in Google Play Console. It consists of .so.dbg files containing the symbols as stripped from the .so files. The App Center web interface should support this format, and state this support in documentation.

https://developer.android.com/build/shrink-code#strip-native-libraries

If your project builds an Android App Bundle, you can automatically include the native debug symbols file in it. To include this file in release builds, add the following to your app's build.gradle file:
android.buildTypes.release.ndk.debugSymbolLevel = { SYMBOL_TABLE | FULL }
...
If your project builds an APK, use the build setting shown earlier to generate the native debug symbols file separately. ... As part of the build process, the Android Gradle plugin outputs this file in the following project location:
app/build/outputs/native-debug-symbols/variant-name/native-debug-symbols.zip