improvement: support `--with` option in `igniter.new` #89

Job	Run time
ash-ci / mix deps.get	21s
ash-ci / MIX_ENV=test mix.compile	37s
ash-ci / audit	34s
ash-ci / MIX_ENV=dev mix.compile	30s
ash-ci / mix docs	22s
ash-ci / mix format --check-formatted	21s
ash-ci / mix dialyzer	2m 11s
ash-ci / mix credo --strict	3s
ash-ci / mix sobelow	20s
ash-ci / mix spark.cheat_sheets --check	4s
ash-ci / mix spark.formatter --check	7s
ash-ci / mix test	52s
ash-ci / mix deps.unlock --check-unused	21s
ash-ci / Deploy docs to GitHub pages.	7s
ash-ci / Release	0s
	6m 50s

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