Introduce schemas for map key constraints #2397

Job	Run time
Babashka	25s
ClojureScript (none)	2m 46s
ClojureScript (advanced)	3m 29s
Clojure 11 (Java 8)	57s
Clojure 12 (Java 8)	1m 45s
ClojureScript (cherry-none)	3m 45s
ClojureScript (cherry-advanced)	3m 42s
Clojure 11 (Java 11)	1m 0s
Clojure 12 (Java 11)	57s
Clojure 11 (Java 17)	1m 0s
Clojure 12 (Java 17)	54s
Clojure 11 (Java 21)	53s
Clojure 12 (Java 21)	52s
	22m 25s

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