Add GraphQL Mutation for Configuring Feature With Model Selection

The Task

This is a BE piece. Create a GraphQL mutation that can disable or update the model selection of a given feature. Send featureID and modelID -- backend will do database update and send success or failure response to the frontend.

Definition of done

• The mutation can disable a feature
• The mutation can update a feature with a selected model
• This could be validated with the http://gdk.test:3000/-/graphql-explorer tool