Android: Missing LDK bindings

[dennisreimann]

When running the app on Android (emulator or device), the LDK bindings are missing and the LN node operations crash with an error like this:

fail: BTCPayApp.Core.Wallet.LightningNodeManager[0]
      Error while starting lightning node
      System.TypeInitializationException: The type initializer for 'org.ldk.impl.bindings' threw an exception.
       ---> System.DllNotFoundException: ldkcsharp
         at org.ldk.impl.bindings..cctor()
         --- End of inner exception stack trace ---
         at org.ldk.structs.FeeEstimator.new_impl(FeeEstimatorInterface arg)
         at BTCPayApp.Core.LDK.LDKExtensions.<>c.<AddLDK>b__5_24(IServiceProvider provider)