Add settings for GraphQL to exclude content types from being exposed

[MikeAlhayek]

Is your feature request related to a problem? Please describe.

Today, GraphQL expose all content types to the user. A permission check is applied to filter out content types user can't view. There is no way to control which content-types should be exposed to the API. Not everyone want to expose every content types. For example, if I have a SitePage content type that I want everyone to be able to view it, but I do not want anyone to query it from the API.

Describe the solution you'd like

We can simply add a content type settings to Hide the content type like we do today for the content parts.

[sebastienros]

OK with it being a content type setting

[MikeAlhayek]

@sebastienros PR #12982 was added for this