Add support for SharePoint lookup column from content type

[CoRouff]

 Post : SharePoint lookup column from content type missing in PowerApps

Following this post, I submit this missing feature between SharePoint and PowerApps.

Currently, there is no way to use a Lookup column from a Content Type into PowerApps.

[LindaKDev]

And, while the Content Type value is visible in a dataset from a SharePoint list, the ContentType.Id value can be displayed but the ContentType.Name value, although selectable, gives an error.  This is apparently a bug that has crept in, with others reporting that it used to work as expected and now doesn't.