Introduce batching on the outermost submit handler.
Introduce batching on the outermost submit handler.

The known clients should only send batches of 100 items each, but there's
nothing enforcing this except for a much larger upload size limit in Nginx.

mozilla/ichnaea,mozilla/ichnaea,therewillbecode/ichnaea,mozilla/ichnaea,therewillbecode/ichnaea,mozilla/ichnaea,therewillbecode/ichnaea