Make ElementModelProvider class public

[mattnield]

I've had to create a copy of this class in my own code in order to work with content-type elements in LanguageVariantModels. This is because I don't want to use generated content models for the piece of work.
In particular, I'm working on translation integration. I don't want that integration to be tied to the content model and therefore be hampered by changes to that model.

Using this method seems to be the only reasonable way to work with the element collection, so I really think it shouldn't be marked as internal.

management-sdk-net/Kontent.Ai.Management/Modules/ModelBuilders/ElementModelProvider.cs

Line 12 in ec7910b

public T GetStronglyTypedElements<T>(IEnumerable<dynamic> elements) where T : new()