[mz-dump] custom queries and daily usage

[sjwiesman]

Motivation

Support for custom queries in the catalog dump along with a specific query to grab materialize usage over time.

Description

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decisions. The diff shows the code --- use this space to explain what the
diff can't tell a reviewer.

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[alex-hunt-materialize]

This seems reasonable to me. I'm not good at SQL, though, so you probably want a second opinion on that part.

The one thing I caution you about here, is if this relation takes significant memory, you may end up OOMing environmentd. This is extra likely as we're probably running against a broken environment which may have very little free memory. This is probably acceptable in this case, but something to keep in mind.