Restrict visibility of UMOEndpointURI attributes once endpoints are created or use something else.

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Endpoints can be configured via uri string, builder etc. The values in EndpointUri of name/transformers/connector are used on endpoint creation to help determine the endpoint values for these attributes, but if the values are overridden by the builder the values in the EndpointURI are not valid and should not be visible.

EndpointURI should be used as a representation of a uri string to configure endpoints, but once endpoints are created only certain EndpointURI attributes should be visible, and they should be read only.

Perhaps EndpointURI can continue to be used for configuring endpoints, but something else used once endpoints are created?