Support H.265

Does ExoPlayer support H.265 (a.k.a HEVC) ?

Currently, if I play a RTSP/RTMP H.264 stream, ExoPlayer has no problem.
But when I play a RTSP/RTMP H.265 stream, ExoPlayer reports an error:

**missing sprop-vps parameter**

```
E/ExoPlayerImplInternal: Playback error
com.google.android.exoplayer2.ExoPlaybackException: Source error
at com.google.android.exoplayer2.ExoPlayerImplInternal.handleIoException(ExoPlayerImplInternal.java:644)
at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:620)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.os.HandlerThread.run(HandlerThread.java:67)
Caused by: java.io.IOException: java.lang.IllegalArgumentException: missing sprop-vps parameter
at com.google.android.exoplayer2.source.rtsp.RtspMediaPeriod$InternalListener.onSessionTimelineRequestFailed(RtspMediaPeriod.java:664)
at com.google.android.exoplayer2.source.rtsp.RtspClient.dispatchRtspError(RtspClient.java:317)
at com.google.android.exoplayer2.source.rtsp.RtspClient.access$700(RtspClient.java:75)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspResponse(RtspClient.java:656)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspMessage(RtspClient.java:507)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.lambda$onRtspMessageReceived$0$com-google-android-exoplayer2-source-rtsp-RtspClient$MessageListener(RtspClient.java:500)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener$$ExternalSyntheticLambda0.run(Unknown Source:4)
at android.os.Handler.handleCallback(Handler.java:942)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:201) 
at android.os.Looper.loop(Looper.java:288) 
at android.os.HandlerThread.run(HandlerThread.java:67) 
Caused by: com.google.android.exoplayer2.source.rtsp.RtspMediaSource$RtspPlaybackException: java.lang.IllegalArgumentException: missing sprop-vps parameter
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspResponse(RtspClient.java:656) 
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspMessage(RtspClient.java:507) 
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.lambda$onRtspMessageReceived$0$com-google-android-exoplayer2-source-rtsp-RtspClient$MessageListener(RtspClient.java:500) 
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener$$ExternalSyntheticLambda0.run(Unknown Source:4) 
at android.os.Handler.handleCallback(Handler.java:942) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loopOnce(Looper.java:201) 
at android.os.Looper.loop(Looper.java:288) 
at android.os.HandlerThread.run(HandlerThread.java:67) 
Caused by: java.lang.IllegalArgumentException: missing sprop-vps parameter
at com.google.android.exoplayer2.util.Assertions.checkArgument(Assertions.java:54)
at com.google.android.exoplayer2.source.rtsp.RtspMediaTrack.processH265FmtpAttribute(RtspMediaTrack.java:421)
at com.google.android.exoplayer2.source.rtsp.RtspMediaTrack.generatePayloadFormat(RtspMediaTrack.java:266)
at com.google.android.exoplayer2.source.rtsp.RtspMediaTrack.(RtspMediaTrack.java:162)
at com.google.android.exoplayer2.source.rtsp.RtspClient.buildTrackList(RtspClient.java:347)
at com.google.android.exoplayer2.source.rtsp.RtspClient.access$1700(RtspClient.java:75)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.onDescribeResponseReceived(RtspClient.java:690)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspResponse(RtspClient.java:598)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspMessage(RtspClient.java:507) 
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.lambda$onRtspMessageReceived$0$com-google-android-exoplayer2-source-rtsp-RtspClient$MessageListener(RtspClient.java:500) 
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener$$ExternalSyntheticLambda0.run(Unknown Source:4) 
at android.os.Handler.handleCallback(Handler.java:942) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loopOnce(Looper.java:201) 
at android.os.Looper.loop(Looper.java:288) 
at android.os.HandlerThread.run(HandlerThread.java:67) 
E/EventLogger: playerFailed [eventTime=0.07, mediaPos=0.00, window=0, period=0, errorCode=ERROR_CODE_IO_UNSPECIFIED
```