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This CL refactors ReportingDeliveryAgent to take NetworkIsolationKeys
of reports and endpoints into account.

It sorts the reports so that only reports with the same NIK and origin
are batched in the same upload. Reports for the same (NIK, origin) but
different groups can still be in the same upload if they share
an endpoint URL. Also reports that get assigned to the same endpoint URL
can be batched together, even if they are assigned to ReportingEndpoints
configured for different origins.

All the NIK fields are still empty except in tests.

Bug: 993805
Change-Id: I953f0b1ff38fbe2625c539e6e00306621f1025d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138566
Commit-Queue: Lily Chen <chlily@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770206}