gosdk(videostreaming): add transcode feature on upload

[cnlangzi]

play media file chunk by chunk feature only works on fMp4 or webp. a transcode feature should be added on file upload. all non-fragmented mp4 file should be converted to fragmented mp4 and upload. see detail https://0chain.slack.com/archives/G014PQ61WNT/p1680750942551589?thread_ts=1680721705.377029&cid=G014PQ61WNT

it will let feature called video streaming supported on web. on mobile/desktop, it should be simply implemented with https://github.com/0chain/zboxcli#streaming

TODO

• add a feature option --web-streaming to enable play it on web with streaming feature.
• if --web-streaming is turn on, a raw video file should be transcoded into another .mp4 file with fMP4 encoding
• both the raw video file and fMP4 file should be uploaded
• when it is played on web player, we should check if there is related mp4 file with fmp4 encoding, if yes, play it with streaming feature, if not, only play it after fully download.
• this feature should be implemented on cli/mobile/desktop/web apps.

[guruhubb]

re both the raw video file and fMP4 file should be uploaded we don't need to upload both files but just the fmp4 only.