Add Feature Management schema

[zhiyuanliang-ms]

This feature management schema will be provided by the Kubernetes provider and it would be recognized by client Feature Management libraries. It would be better to place the schema in the App Config repo instead of the Feature Management repo, as discussed here

[jimmyca15]

I would say this is Microsoft Feature Management schema.

The schema that describes individual flag is the Microsoft Feature Flag Schema.

[zhiyuanliang-ms]

I like the idea naming this schema as Microsoft Feature Management.
@zhenlan

As discussed in the email thread, snake_casing will be used:

"feature_management": {
  "feature_flags": [
     {
       // Microsoft feature flag schema
     }
  ]
}

[rossgrambo]

$ref should be the uri of the file rather than the $id. I believe ./FeatureFlag.v1.1.0.schema.json would work, but to make it work without folder context- I think we should do: https://github.com/Azure/AppConfiguration/blob/main/docs/FeatureManagement/FeatureFlag.v1.1.0.schema.json

[zhiyuanliang-ms]

Suggested change

	"title": "A Microsoft Feature Management Configuration",
	"title": "The Microsoft Feature Management Schema",