Investigate and document LiveRamp integration

[aram356]

[jevansnyc]

https://docs.liveramp.com/identity/en/implementing-liveramp-s-real-time-identity-service-tag.html

[jevansnyc]

still waiting to hear back

[jevansnyc]

LR came back with docs site, so need to test.

[jevansnyc]

Liveramp suggested reviewing this:

https://developers.liveramp.com/authenticatedtraffic-api/docs/4-call-the-ats-envelope-api

[aram356]

@prk-Jr to write spec and understand feasibility