Feature/new types

[paribaker]

This PR adds a new export that creates the formfield types for a user, this should function similar to the method we have in tn-models. Will update the readme after it is properly tested.

Example usage:

class SomeForm extends Form<any>{
   static name = FormField.create()
   static email = FormField.create()


}

TSomeForm = SomeForm & ExtractFormFields<SomeForm>