* Expose more shared properties from TextDocument on CustomDocument

Copies some shared properties from `TextDocument` to `CustomDocument`. We may want to consider this since `CustomDocument` is intented to be subclassed, and there is the risk after shipping the custom editor api that one of these subclasses could implement a property/method such as `version` which would break if we added a `CustomDocument.version` property at a later time

Notebook Edit API

Part of #90087