improvement: add `traverse_errors/2` callback and function to Splode #254

Job	Run time
ash-ci / mix igniter.upgrade	8s
ash-ci / REUSE compliance	11s
ash-ci / MIX_ENV=test mix.compile	29s
ash-ci / Community Files Check	3s
ash-ci / audit	44s
ash-ci / Report Mix Dependencies	15s
ash-ci / mix format --check-formatted	23s
ash-ci / mix spark.formatter --check	5s
ash-ci / mix dialyzer	2m 46s
ash-ci / mix credo --strict	54s
ash-ci / mix spark.cheat_sheets --check	8s
ash-ci / mix test	1m 11s
ash-ci / MIX_ENV=dev mix.compile	31s
ash-ci / mix sobelow	26s
ash-ci / mix deps.unlock --check-unused	29s
ash-ci / mix doctor --full --raise	-1s
ash-ci / mix ash.codegen --check	-1s
ash-ci / mix git_ops.check_message	-1s
ash-ci / mix docs	1m 0s
ash-ci / Deploy docs to GitHub pages.	10s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	-1s
ash-ci / Release	-1s
	9m 48s

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