Strapi: Ability to make fields private in Content Builder plugin

[chaitanyya]

• [ ] I have created my request on the Product Board before I submitted this issue
• [x] I have looked at all the other requests on the Product Board before I submitted this issue

Please describe your feature request:
Currently, we do have the ability to make fields private using the following attribute in the model settings.json file.

"address": {
  "default": null,
  "type": "string",
  "private": true
}

UI Suggestion for Content Type Builder
The content-type-builder plugin doesn't yet support this, maybe having a Private field checkbox on the advanced settings would do. Something like:

[Aurelsicoko]

Excellent idea! Do you have the time to make a PR for this feature? We'll be happy to merge it 👍

[chaitanyya]

I'm happy to work on it, I'm currently working on the attributeId PR for the bookshelf. As soon as that's completed I'll start on this one.

[lauriejim]

Thank you @chaitanyya for your contribution.