add data streaming for text and jsonl data formats

to start with ... see:

https://github.com/RandomFractals/vscode-data-preview/blob/master/src/data.providers/text.data.provider.ts

https://github.com/RandomFractals/vscode-data-preview/blob/master/src/data.providers/json.line.data.provider.ts

& change it to read line and update data view data per line for faster and more responsive UX text and jsonl docs loading ...