Feature request: cattax support in bidResponseFilter

[dgirardi]

Type of issue

Feature request

Description

The bidResponseFilter module should support ORTB 2.6 cattax.

Proposal

• update ortbConverter to carry over cattax from ORTB seatbid.bid.cattax into bid response's meta.cattax.
• bidResponseFilter should check response categories (meta.primaryCatId/meta.secondaryCatIds) against requests' bcat only when meta.cattax matches the request's cattax. (When not specified, cattax defaults to 1).
• When cattax does not match, the category should be considered unknown for the purposes of filtering (and controlled by the blockUnknown config).