Add the NewFormClientSideComponentId and related properties to the ContentType model

[tomasz-sintel]

When developing an SPFx form customizer, the component needs to be connected to the list via properties in the content type (reference).
Those properties (e.g. NewFormClientSideComponentId) are not available in the ContentType class.
Having to have some plug "on the side" in the form of a REST or PS script is not elegant.
My request is to add those properties to the ContentType class.

[jansenbe]

That makes sense @tomasz-sintel , I've created an issue to track this ask