support: introduce opt-in feature for returning partial response (v2)

[meetzaveri]

Is your proposal related to a problem?

In current scenario (in Hasura v2), if suppose the developer adds a column to DB , adds it to their frontend query but fails to update Hasura column permissions, it will result into "fail hard" error. It wouldn't's show any data and provide error like

For example if you forgot to add address field in column permissions,

{
  "errors": [
    {
      "extensions": {
        "path": "$.selectionSet.user.selectionSet.address",
        "code": "validation-failed"
      },
      "message": "field \"address\" not found in type: 'user'"
    }
  ]
}

Describe the solution you'd like

The feature request is raised here to address that if there was opt-in configuration, where if user toggles it "on", then it would mean it would allow developer to make inform graphql-engine to return partial response , failing soft , where you return data for columns which exists in column permissions but return null as value for column which doesn't exist in column permissions.

For example, the response would look like (if you forgot to add address field in column permissions )

{
  data: {
    id: "123",
    username:"xyz",
    address: null
   }
}