improvement: add `AshGraphql.Type` #759

Job	Run time
ash-ci / mix deps.get	28s
ash-ci / MIX_ENV=test mix.compile	33s
ash-ci / MIX_ENV=dev mix.compile	27s
ash-ci / mix hex.audit	25s
ash-ci / mix format --check-formatted	45s
ash-ci / mix dialyzer	5m 23s
ash-ci / mix sobelow	40s
ash-ci / mix credo --strict	32s
ash-ci / mix test	2m 3s
ash-ci / mix spark.cheat_sheets --check	32s
ash-ci / mix deps.unlock --check-unused	28s
ash-ci / mix spark.formatter --check	32s
ash-ci / Release	0s
	12m 48s

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