Zeta Global SSP Analytics Adapter: add docs for new analytics adapter

[abermanov-zeta]

No description provided.

[MartianTribe]

Please add either or both:
pbs:true
pbjs:true

as well as the version you support:

pbjs_version_notes: vx.xx and later

to the front matter.

[abermanov-zeta]

@MartianTribe Thank you for your review. I've added the requested fields. Could you please review it again?

I'd like to mention that there is no a word about those fields in the doc here - https://docs.prebid.org/dev-docs/integrate-with-the-prebid-analytics-api.html#step-5-website-pull-request , also I could not find them in any other analytics adapter docs in the repo. These fields are mentioned in docs related to bidder adapters only. It's a bit confusing :)

Thank you.

[bretg]

Being an analytics adapter, the pbjs: true flag is unnecessary, but is fine. Going to talk to the website team about whether pbjs_version_notes is really required. It's useful, sure, but I agree that if it's required, needs to be in the docs.