wasm(livestreaming): implement `stream` feature with ffmpeg-wasm on browser

it is implemented based on local audio/camera device in cli as `./zbox stream` now.
it should be implemented based on ffmpeg-wasm and webcam on browser

it is the feature called `live streaming`

## TODO
- capture streaming from audio/webcam by H5 apis and ffmpeg
- read output from ffmpeg-wasm , and upload them to blobbers

see more detail from https://github.com/0chain/zboxcli#stream and https://app.slack.com/client/T9C1E9JEB/threads/thread/GREHVKQKS-1676148868.722449

Review the existing CLI stream command in the zboxcli repository to understand the current implementation. Investigate using HTML5 APIs for webcam/audio capture and ffmpeg-wasm for processing in the browser. The output must be uploaded to blobbers, so examine the gosdk's upload mechanisms. This is a complex, cross-cutting feature requiring integration of multiple unfamiliar subsystems.

Written by the indexing model from the issue text.