Explore using sdk from webworker

[jak-pan]

This would improve in-browser performance in multiple ways:

1. Multiple pages can connect to single websocket connection via shared worker (not compatible with mobile chrome)
2. All the RPC connection logic can run independently of browser window
3. We can cache whole sdk state in separate thread with all the computations and not block frontend
4. We will need to solve potentially running different environments (testnets) or connection to different chains at the same time