feat: add JSON schema (in yaml for readability)

[lachrist]

Based on: https://appland.com/docs/reference/appmap-python.html#configuration
I wrote it in yaml for readability.

To quickly check it out:

• Convert to json: https://onlineyamltools.com/convert-yaml-to-json
• Try it out: https://onlineyamltools.com/convert-yaml-to-json

[torchello]

Great, thanks!

[appland-release]

🎉 This PR is included in version 0.59.2 🎉

The release is available on:

• v0.59.2
• GitHub release

Your semantic-release bot 📦🚀