Update participant configuration json schema

[VLukasBecker]

Subject

• Update of participant configuration JSON schema.
  • Experimental config will be shown in the schema
  • Examples will be added to the schema
  • The schema should be equal to the schema in the schemastore repo
• Update of the configuration files
• Validation of config files
  • git workflow which runs a python file to check the configs against the schema

[VDanielEdwards]

Looks good, just some small things I noticed 👍

[VDanielEdwards]

Great work! 👍 Just an idea with the "enum".