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Describe the purpose of your pull request
Adopt the Styler library, which is an Elixir formatter plugin that imposes some opinionated formatting on the code in place of a number of Credo rules.
While I don't always prefer its opinions, I really like having it auto-fix a number of issues, and I find that it's worth the tradeoff to adopt it.
NOTE: This PR is based on #115 because Elixir 1.15 fixes a formatter race condition in the VSCode ElixirLS plugin. In earlier versions of Elixir, the formatter wouldn't always run correctly when saving a file. Since Styler is a formatter plugin, the problem was even more noticeable.
Related issues (only if applicable)
None
Requirement checklist (only if applicable)