Added Android UWB code

_android/src/no/nordicsemi/android/ble/TimeoutHandler.java

@@ -0,0 +1,13 @@
+package no.nordicsemi.android.ble;
+
+import androidx.annotation.NonNull;
+
+abstract class TimeoutHandler {
+
+	/**
+	 * Method called when the request timed out.
+	 *
+	 * @param request the request that timed out.
+	 */
+	abstract void onRequestTimeout(@NonNull final TimeoutableRequest request);
+}