Resolve many lookups in one call

An array of lookup requests in; an array of lookup responses out, same order,
one-to-one. Each item carries its own timestamp, so an impression log enriches
against the schedule as of each impression, and its own verbose. An invalid
item gets an error entry in its slot while the other items resolve normally.
Exceeding the documented item cap fails the whole batch with 400. Each item counts
as one unit against your rate limit and your usage. No latency SLA on batch.

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