fix (webapp): make sure that Pyodide doesn't affect responsiveness.

[hwelsters]

Is your feature request related to a problem? Please describe.
Infinite loops currently cause the entire website to freeze.
For example, the following snippet of code:

Describe the solution you'd like
There are a few options:

• Implement some way of making sure that the code times out after a certain period of time.
  This could be by using some built-in function in Pyodide itself.
  If we find some way to do it using Javascript as well, I would be fine with the solution.
• Run Pyodide in a webworker so that slow Python code will not affect the website's responsiveness. (This solution is definitely preferrable since the user won't have to wait for 5 seconds or whatever the timeout time is.)

Directions
In terms of where to start, pyodide-provider.tsx is where Pyodide is loaded and where there are functions to run Python code.
https://pyodide.org/en/stable/usage/webworker.html