Add benchmark for batch decoding

[ahmadsharif1]

The benchmark shows that we are slower than non-batch for batch decoding. We can make improvements to the decoder to make this more performant.

python benchmarks/decoders/benchmark_decoders.py --bm_video_paths=/home/ahmads/personal/lerobot/benchmarks/video/outputs/video_benchmark/videos/libx264_yuv420p_None_None/lerobot_pusht_image.mp4,/home/ahmads/personal/lerobot/benchmarks/video/outputs/video_benchmark/videos/libx265_yuv420p_None_None/lerobot_pusht_image.mp4,/home/ahmads/jupyter/853.mp4 --decoders=torchvision,torchcodec,torchcodec_batch
[ video=/home/ahmads/personal/lerobot/benchmarks/video/outputs/video_benchmark/videos/libx264_yuv420p_None_None/lerobot_pusht_image.mp4 h264 96x96, 16.1s 10.0fps ]
                                             |  10 seek()+next()  |  1 next()  |  10 next()  |  100 next()
1 threads: -----------------------------------------------------------------------------------------------
      TorchCodecDecoderNonCompiled           |        30.6        |    14.9    |     16.6    |     37.0   
      TVNewAPIDecoderWithBackendVideoReader  |        62.7        |     4.0    |      5.0    |     15.1   
      TorchCodecDecoderNonCompiledBatch      |        36.7        |    16.9    |     19.8    |     34.5   

Times are in milliseconds (ms).

[ video=/home/ahmads/personal/lerobot/benchmarks/video/outputs/video_benchmark/videos/libx265_yuv420p_None_None/lerobot_pusht_image.mp4 hevc 96x96, 16.1s 10.0fps ]
                                             |  10 seek()+next()  |  1 next()  |  10 next()  |  100 next()
1 threads: -----------------------------------------------------------------------------------------------
      TorchCodecDecoderNonCompiled           |        31.2        |    20.4    |     22.2    |     42.9   
      TVNewAPIDecoderWithBackendVideoReader  |        68.9        |     3.6    |      4.6    |     15.9   
      TorchCodecDecoderNonCompiledBatch      |        33.6        |    27.8    |     28.9    |     45.1   

Times are in milliseconds (ms).

[---------- video=/home/ahmads/jupyter/853.mp4 h264 3840x2160, 4.988317s 59.94005593469701fps -----------]
                                             |  10 seek()+next()  |  1 next()  |  10 next()  |  100 next()
1 threads: -----------------------------------------------------------------------------------------------
      TorchCodecDecoderNonCompiled           |       1917.2       |   243.9    |    388.7    |    1665.2  
      TVNewAPIDecoderWithBackendVideoReader  |      28424.0       |   268.6    |    905.9    |   11896.4  
      TorchCodecDecoderNonCompiledBatch      |       2035.0       |   314.8    |    523.0    |    3046.3  

Times are in milliseconds (ms).

[ video=/home/ahmads/personal/lerobot/benchmarks/video/outputs/video_benchmark/videos/libx264_yuv420p_None_None/lerobot_pusht_image.mp4 h264 3840x2160, 4.988317s 59.94005593469701fps ]
                                    |  create()+next()
1 threads: -------------------------------------------
      TorchCodecDecoderNonCompiled  |        14.9     

Times are in milliseconds (ms).