feat: Add absinthe dependency and plugin in formatter of installer #1183

Job	Run time
ash-ci / mix deps.get	23s
ash-ci / MIX_ENV=dev mix.compile	24s
ash-ci / audit	38s
ash-ci / MIX_ENV=test mix.compile	48s
ash-ci / mix docs	29s
ash-ci / mix credo --strict	41s
ash-ci / mix dialyzer	3m 43s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix format --check-formatted	47s
ash-ci / mix sobelow	40s
ash-ci / mix spark.cheat_sheets --check	41s
ash-ci / mix spark.formatter --check	48s
ash-ci / mix deps.unlock --check-unused	39s
ash-ci / mix test	1m 7s
ash-ci / Deploy docs to GitHub pages.	0s
ash-ci / Release	0s
	11m 48s

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