Add web-worker capability

[gopi-suvanam]

Problem Right now the user code runs in the main thread of the application itself. this causes bad user experience because the page hangs for long compute. Also a compute cannot be "killed" midway.

Proposed Solution

• Implement the compute in webworker
• Provide functionality to interact with DOM from webworker using a library
• Ensure show, error, plotly work even with webworker

Alternatives considered Async function - that still blocks the eventloop

Additional context Jupyter runs the user generated python in a seperate thread called the "kernal" the messages are seamless passed back to the UI. Of course python does not interact with DOMs.

[gopi-suvanam]

run_in and run_in_ww have been added for webworker support.