New routing policy, derived from wanting to introduce a new policy for content based routing based on headers and combining with existing policies that allow to route traffic.

Implementation proposal after discussion between engineering and product can be found here
https://docs.google.com/document/d/1NYVGXbpZekKZcF3er4dr03P-wC2cXMohpnlvuXQq1Ok/edit#heading=h.xax1ceepxn14