yml: Move json schema from python dict to standalone json file

[ciarancourtney]

• Easier to reference as schema for IDEs
• Can be added to schemastore.org

Signed-off-by: ciarancourtney 6096029+ciarancourtney@users.noreply.github.com

Hi,

Please consider this a draft since I had trouble running the tests and hopefully this kicks of your CI.

I also didn't follow the contrib guide to the letter, maybe its ok for this small change?

[henning-schild]

This looks like a good idea, but patches have to be send to the mailinglist. Please consult https://github.com/siemens/kas/blob/master/CONTRIBUTING.md.