Description

Adds ArchUnit tests to validate naming conventions.
kind of jank, and could probably be improved, as I don't have experience with ArchUnit.

Based on the discussion in #2074

There are several different places where the test fails, so those places are special-cased to be ignored (per the discussion). Many of those places, however, could (and should) be package-private. (specifically, the instances where a method either starts with or ends with an underscore)

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