Include timing info in some SCTE-35 `toString` implementations

This was helpful in investigating Issue: androidx/media#471

PiperOrigin-RevId: 545393217
(cherry picked from commit b076a670b6a922d279e62fe7417eda1b660421a9)

library/extractor/src/main/java/com/google/android/exoplayer2/metadata/scte35/PrivateCommand.java

@@ -58,6 +58,15 @@ public final class PrivateCommand extends SpliceCommand {
     return new PrivateCommand(identifier, privateBytes, ptsAdjustment);
   }
 
+  @Override
+  public String toString() {
+    return "SCTE-35 PrivateCommand { ptsAdjustment="
+        + ptsAdjustment
+        + ", identifier= "
+        + identifier
+        + " }";
+  }
+
   // Parcelable implementation.
 
   @Override

library/extractor/src/main/java/com/google/android/exoplayer2/metadata/scte35/SpliceInsertCommand.java

@@ -225,6 +225,15 @@ public final class SpliceInsertCommand extends SpliceCommand {
     }
   }
 
+  @Override
+  public String toString() {
+    return "SCTE-35 SpliceInsertCommand { programSplicePts="
+        + programSplicePts
+        + ", programSplicePlaybackPositionUs= "
+        + programSplicePlaybackPositionUs
+        + " }";
+  }
+
   // Parcelable implementation.
 
   @Override

library/extractor/src/main/java/com/google/android/exoplayer2/metadata/scte35/TimeSignalCommand.java

@@ -69,6 +69,15 @@ public final class TimeSignalCommand extends SpliceCommand {
     return ptsTime;
   }
 
+  @Override
+  public String toString() {
+    return "SCTE-35 TimeSignalCommand { ptsTime="
+        + ptsTime
+        + ", playbackPositionUs= "
+        + playbackPositionUs
+        + " }";
+  }
+
   // Parcelable implementation.
 
   @Override

testdata/src/test/assets/playbackdumps/ts/sample_scte35.ts.dump

@@ -13,10 +13,10 @@ MediaCodecAdapter (exotest.video.mpeg2):
 MetadataOutput:
   Metadata[0]:
     presentationTimeUs = 33366
-    entry[0] = SCTE-35 splice command: type=SpliceInsertCommand
+    entry[0] = SCTE-35 SpliceInsertCommand { programSplicePts=200000, programSplicePlaybackPositionUs= 1000000822222 }
   Metadata[1]:
     presentationTimeUs = 33366
-    entry[0] = SCTE-35 splice command: type=SpliceInsertCommand
+    entry[0] = SCTE-35 SpliceInsertCommand { programSplicePts=200000, programSplicePlaybackPositionUs= 1000000822222 }
   Metadata[2]:
     presentationTimeUs = 33366
-    entry[0] = SCTE-35 splice command: type=SpliceInsertCommand
+    entry[0] = SCTE-35 SpliceInsertCommand { programSplicePts=300000, programSplicePlaybackPositionUs= 1000001933333 }