New Adapter: Criteo

[benjaminch]

Hello PBS Team :)

This PR aims to plug Criteo's adapter. We still have couple things to test on our end but would love to have a review on this adapter in the meantime.

One question, we will be using user.ext.eids to retrieve Criteo's user ID. While testing locally, I was trying to get outgoing bid request to Criteo but somehow, I was never able to have anything populated inside PBS user.ext.eids, I might miss something here, if you have any idea it would help me to do an end to end test.

Here's the bid request I send to PBS:

{ "id":"test-request-id", "site":{ "id":"site-id", "page":"criteo.com" }, "device":{ "os":"android", "ip":"91.199.242.236", "ua":"random user agent" }, "user":{ "ext":{ "eids":[ { "source":"criteo.com", "uids":[ { "id":"criteo-eid" } ] }, { "source": "pubcommon", "id":"11111111" } ] } }, "imp":[ { "id":"test-imp-id", "banner":{ "format":[ { "w":300, "h":250 } ] }, "ext":{ "criteo":{ "zoneid":123456, "networkid":78910 } } } ] } 

Also, we would like to be off by default, and publishers we are already working / whiling to work with us would have to reach their Criteo point of contact. I guess this should be described in adapter's description on prebid documentation website, if so, I will edit the description and link it to this PR.

Cheers !