[media] Limit max number of buffers to write with audio write ahead

[borongc]

Limit the maximum number of reads from DemuxerStream in the range of [1, max_number_of_buffers_to_write]. Cobalt can support writing of multiple samples to speed up playback start and seek (b/227837774). However, to avoid writing excessive audio data to SbPlayer, Cobalt estimates the maximum number of writes with audio write ahead |audio_write_duration_|. The number of writes is the minimum value of the estimated value and |max_number_of_buffers_to_write| if Cobalt allows batched sample write via H5VCC flag.

For audio preroll:

1. When audio codec is aac, opus, or e/ac3, Cobalt uses default numbers as maximum number of writes, which are computed by commonly used sampling rate and frames per DecoderBuffer.
2. For other audio codecs, Cobalt uses the time difference between input buffers to estimate how many input buffers to write with |audio_write_duration_|.
3. The maximum number of sample writes for IAMF is pending implementation in b/41486346.

After audio preroll, Cobalt estimates the number of writes with the difference between |audio_write_duration_| and |time_ahead_of_playback|.

b/342484772

Test-On-Device: true