Add streaming interface to NormalizedNodeDataInput

Add streaming interface to NormalizedNodeDataInput

NormalizedNodeDataInput allows reading NormalizedNodes, which is
wired directly to immutable node builders, providing little
flexibility.

This inflexibility requires us to re-stream the data set through
NormalizedNodePruner, effectively doubling memory requirements
during recovery.

Extend NormalizedNodeDataInput to have a NormalizedNodeStreamWriter
to be plugged in, so that the byte stream becomes a source of
NormalizedNodeStreamWriter events, which can be routed through
a custom-built pipeline.

readNormalizedNode() becomes a simple default wrapper, which
pipes the stream into an ImmutableNormalizedNodeStreamWriter.

JIRA: CONTROLLER-1889
Change-Id: Ic732ba9105dd7e27d5612853b931aba66bdd83a5
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>