refactor: handle io formatting more uniformly #726

Job	Run time
ash-ci / mix deps.get	16s
ash-ci / mix igniter.upgrade	0s
ash-ci / audit	35s
ash-ci / MIX_ENV=test mix.compile	34s
ash-ci / mix credo --strict	4s
ash-ci / MIX_ENV=dev mix.compile	21s
ash-ci / mix docs	25s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix dialyzer	2m 31s
ash-ci / Deploy docs to GitHub pages.	0s
ash-ci / mix format --check-formatted	27s
ash-ci / mix sobelow	3s
ash-ci / mix spark.cheat_sheets --check	19s
ash-ci / mix spark.formatter --check	6s
ash-ci / mix test	1m 25s
ash-ci / mix deps.unlock --check-unused	22s
ash-ci / Release	0s
	7m 28s

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