Issue 2077: Add sample playwright tests for folium

[hansthen]

Gentlemen, I created a sample test using playwright and streamlit. This is not a full test suite, but more of a demonstration how we can use Playwright to test our example apps. I have used Playwright for a few other projects and I like how it works. It also comes with a nice codegen utility that can be used to jumpstart creating tests.

Let me know what you think of it.