PoC for SQL snippet library, tests

[pkarman]

connects #12044

Description

Basic proof of concept for SQL snippet library.

Adds a spec helper expect_sql that returns the results of a SQL query as an array of hashes, suitable for comparing to ActiveRecord objects.

Also adds a as_hash method to all our ActiveRecord models to make such comparisons possible.

[va-bot]

1 Warning

⚠️

This PR adds one or more new specs. If the specs use the DB, see if you can rewrite them so they don’t use the DB, such as by using build_stubbed. If they must use the DB, please remember to add the appropriate require statements and either the :postgres or :all_dbs tags, as documented in our Wiki: https://github.com/department-of-veterans-affairs/caseflow/wiki/Testing-Best-Practices#tests-that-write-to-the-db

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[codeclimate]

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[lomky]

Couple thoughts for you to double-check, otherwise looks good!