The audit chore will be pushing a large number of segments to be
audited, and the db might choke on that large insert when under load.
This change divides the insert up into batches, which can be sized
however is optimal for the backing database. It also arranges for
segments to be inserted in the order of the primary key, which helps
performance on some systems.
Refs: https://github.com/storj/storj/issues/5228
Change-Id: I941f580f690d681b80c86faf4abca2995e37135d
Since the auditor will be moving to a different process from the
metainfo loop, we need a way of communicating which segments have
been chosen for audit. This queue will be that communication, for now.
Contrast this with the queue for _re_verifications in commit 9c67f62f.
Refs: https://github.com/storj/storj/issues/5251
Change-Id: I9a269c7ef21e6c5e9c6e5e1f3db298fe159a8a79
