[WIP] Add predicate methods for settings retrieval

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Match Settings via predicates</issue_title> <issue_description>Given a setting Settings.show_shiny_badges it would be awesome to be able to query them as predicates via something like Settings.show_shiny_badges? which doesn't appear to currently be a thing. In this case it would simply return the truthiness of the value but it may still add some value and read like idiomatic Ruby while we're at it?

Thoughts? </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ckdake/setler#23

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