feat: subscription dsl (#97) #1174

Job	Run time
ash-ci / mix deps.get	6m 53s
ash-ci / MIX_ENV=test mix.compile	4m 44s
ash-ci / MIX_ENV=dev mix.compile	4m 17s
ash-ci / audit	4m 42s
ash-ci / mix docs	33s
ash-ci / mix format --check-formatted	34s
ash-ci / mix spark.cheat_sheets --check	36s
ash-ci / mix spark.formatter --check	35s
ash-ci / mix sobelow	35s
ash-ci / mix credo --strict	48s
ash-ci / mix dialyzer	5m 42s
ash-ci / mix test	1m 4s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix deps.unlock --check-unused	41s
ash-ci / Deploy docs to GitHub pages.	7s
ash-ci / Release	0s
	31m 51s

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