discovery

Describe the solution you'd like
When adding a configmap via the config-map field in a plugin, if we see they are adding a yaml file, why not parse it and try and see if its valid yaml? Especially with the whitespace of nesting it this can cause issues and I've hit the problem more than once.

I assume we could do a basic json/yaml validation, more if others request it.

**Anything el

Add a sample that shows how to add a custom endpoint using the management endpoints library.