Remove BasePlayer stop as a final method.

It calls through to a deprecated method, which is unusual for a
convenience method, and the deprecated method has various
implementations. This allows for a smoother removal of stop(boolean)
and removes an obstacle for the ExoPlayer-SimpleExoPlayer merge.

Adds missing @Deprecated tags to some Players.

PiperOrigin-RevId: 400213422

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -494,6 +494,12 @@ public final class CastPlayer extends BasePlayer {
   }
 
   @Override
+  public void stop() {
+    stop(/* reset= */ false);
+  }
+
+  @Deprecated
+  @Override
   public void stop(boolean reset) {
     playbackState = STATE_IDLE;
     if (remoteMediaClient != null) {

library/common/src/main/java/com/google/android/exoplayer2/BasePlayer.java

@@ -228,11 +228,6 @@ public abstract class BasePlayer implements Player {
   }
 
   @Override
-  public final void stop() {
-    stop(/* reset= */ false);
-  }
-
-  @Override
   public final int getNextWindowIndex() {
     Timeline timeline = getCurrentTimeline();
     return timeline.isEmpty()

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -739,6 +739,12 @@ import java.util.concurrent.CopyOnWriteArraySet;
   }
 
   @Override
+  public void stop() {
+    stop(/* reset= */ false);
+  }
+
+  @Deprecated
+  @Override
   public void stop(boolean reset) {
     stop(reset, /* error= */ null);
   }

library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java

@@ -1378,6 +1378,11 @@ public class SimpleExoPlayer extends BasePlayer
     player.setForegroundMode(foregroundMode);
   }
 
+  @Override
+  public void stop() {
+    stop(/* reset= */ false);
+  }
+
   @Deprecated
   @Override
   public void stop(boolean reset) {

testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java

@@ -417,6 +417,12 @@ public class StubExoPlayer extends BasePlayer implements ExoPlayer {
   }
 
   @Override
+  public void stop() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Deprecated
+  @Override
   public void stop(boolean reset) {
     throw new UnsupportedOperationException();
   }