Refactored mkv_extractor_fuzzer

Following updates are done to the fuzzer:
1. Video tracks have been added to corpus for the following video Codec IDs:
'V_MPEGH/ISO/HEVC', 'V_MPEG4/ISO/ASP', 'V_AV1', 'V_MJPEG'
 and 'V_MS/VFW/FOURCC'.
2. Audio tracks have been added to corpus for the following audio Codec IDs:
'A_OPUS', 'A_FLAC', 'A_MPEG/L2', 'A_PCM/INT/LIT', 'A_PCM/INT/BIG'
and 'A_MS/ACM'.
3. Coverage improved from 74% to 82%.

exec/s: 620
Test: ./mkv_extractor_fuzzer corpus/
Bug: 318031917

Change-Id: I70761c44b3aca9f5e89d006ae64e9220bce3679b