[next] Add new filter-utils.lua script to enable smart filter policy
This MR addresses all the comments discussed in the related old merge request (!522 (closed)).
The new design does not implement a new module for the filters API. Instead, it implements a filter-utils.lua
script that provides an API for the policy to easily handle filter nodes. The filter configuration is done by setting actual properties in the filters. A new filters
metadata is also created to change the filters configuration at runtime.
See this comment for more information: !522 (comment 1990392)
cc @ashoks