android: remove JitsiMeetViewAdapter

It was never used and typicallt the Activity / Fragment holding the
JitsiMeetView object will be the listener.

In addition, once we refactor the events they will be reduced into far fewer.

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetViewAdapter.java

@@ -1,51 +0,0 @@
-/*
- * Copyright @ 2017-present Atlassian Pty Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jitsi.meet.sdk;
-
-import java.util.Map;
-
-/**
- * Implements {@link JitsiMeetViewListener} so apps don't have to add stubs for
- * all methods in the interface if they are only interested in some.
- */
-public abstract class JitsiMeetViewAdapter
-    implements JitsiMeetViewListener {
-
-    @Override
-    public void onConferenceFailed(Map<String, Object> data) {
-    }
-
-    @Override
-    public void onConferenceJoined(Map<String, Object> data) {
-    }
-
-    @Override
-    public void onConferenceLeft(Map<String, Object> data) {
-    }
-
-    @Override
-    public void onConferenceWillJoin(Map<String, Object> data) {
-    }
-
-    @Override
-    public void onConferenceWillLeave(Map<String, Object> data) {
-    }
-
-    @Override
-    public void onLoadConfigError(Map<String, Object> data) {
-    }
-}