RaspberryPiFoundation/editor-ui#903

Based on: https://dev.to/stefnotch/enabling-coop-coep-without-touching-the-server-2d3n

This pull request adds experimental support for running Python programs
using Pyodide. The code is based on the
[python-execution-prototypes](https://github.com/RaspberryPiFoundation/python-execution-prototypes)
and the [technical
analysis](https://docs.google.com/document/d/1mpKliJaqYYkPJR1hGLZxUDhNFOwgBm69nc70iiVj_3I/edit#heading=h.3orc9tdzyy4b)
document. The related GitHub issue is
#891.

The PyodideRunner.jsx can be used instead of the current
PythonRunner.jsx (Skulpt) by provided a `?pyodide=true` parameter in the
URL as shown in the screenshot below:

<img width="1439" alt="Screenshot 2024-01-30 at 11 39 01"
src="https://github.com/RaspberryPiFoundation/editor-ui/assets/892251/a0185ec3-aaf5-40d4-a5e8-e9973fb1c98f">

### Notes

The PyodideRunner supports the following features:
- Execution of Python programs
- Importing of [most
of](https://pyodide.org/en/stable/usage/wasm-constraints.html) Python's
standard library
- Importing of [many
common](https://pyodide.org/en/stable/usage/packages-in-pyodide.html)
Python packages
- Importing of pure Python packages from PyPi
- Stopping execution
- Sending standard input to Python programs
- Closing the standard input stream by pressing `Ctrl-d`
- Visualising turtle graphics using the [modified turtle
package](https://github.com/RaspberryPiFoundation/turtle)
- Visualising pygal charts using the [modified pygal
package](https://github.com/RaspberryPiFoundation/pygal.js)

Due to time constraints, the following tasks remain outstanding:

- Visualising sense_hat graphics using the [modified sense_hat
package](https://github.com/RaspberryPiFoundation/sense_hat)
- There is a work-in-progress pull request
[here](#913)
- Apply HTTP headers in a service worker (see
#903)
- Note that `crossorigin` will need to be added to cross-domain
resources once the HTTP headers are added
- Add unit/integration tests that run real Python programs through the
PyodideRunner.jsx
- Manual testing for backwards compatibility of existing Python
programs, projects and the WebComponent
- Implementing the p5 package to work with Pyodide
- See
https://github.com/RaspberryPiFoundation/python-execution-prototypes/issues/1
- Implementing a dedicated SQL editor for use in the Ada CS project
- Note that Pyodide supports importing `sqlite3` so we can add a UI
wrapper around it

---------

Co-authored-by: Scott Adams <[email protected]>