add ingest-container command (new CLI tool)

The intent of this tool is to make it easy to enque ingest requests into
kafka, to be processed by a worker pool and eventually end up inserted
into fatcat (for ingest hits that pass various checks).

As a specific example use-case, we have pretty good coverage of eLife (a
prominent OA publisher), but have missed some publications in the past,
and have a large gap for the year 2019:

  https://fatcat.wiki/container/en4qj5ijrbf5djxx7p5zzpjyoq/coverage

This tool would make it trivial to enqueue all the missing releases to
be crawled.

Future variants on this tool could query for, eg, long-tail OA works.

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