Refactor common value extraction

This change pulled the common value extraction functionality out into
its own structure that can be used to extract common values from
multiple sets of properties.

Precursor to follow up changes that will allow properties to contain
embedded structures making it easier to share functionality across
sdk member types.

Bug: 142935992
Test: m nothing
Change-Id: Ic902ed61e40ced7a2c2fa4b5f793f532c6fc0034