Description

This MR allows ws references to define after the constructor a way to read or write onmessage and other listeners without throwing on Pyodide.

Changes

• use setattr to avoid Pyodide issue with assigning JS attributes
• reflect what's been documented already as possibilities (both constructor and attributes through the reference)

Checklist

• All tests pass locally
• I have updated CHANGELOG.md
• I have created documentation for this(if applicable)