BUG-1275: teach NormalizedNode builders about size hints

With the upcoming codec work we will be able to offer sizing hints
when instantiating normalized nodes. This patch exposes the methods to
pass those hints down to the implementation maps, so they can size
themselves.

Change-Id: Idbc39bda3937d11c89b89807bd253afca5d775f7
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-1275: teach NormalizedNode builders about size hints"