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

審查 zboxcli 儲存庫中現有的 CLI stream 命令，以了解當前的實作。研究使用 HTML5 API 進行網路攝影機/音訊擷取，以及使用 ffmpeg-wasm 在瀏覽器中進行處理。輸出必須上傳到 blobbers，因此請檢查 gosdk 的上傳機制。這是一個複雜的、跨領域的功能，需要整合多個不熟悉的子系統。

由索引模型根據 Issue 內容生成。