Implement JsonSchemaAs for KeyValueMap (#713) #1959

Job	Run time
Build and Test (ubuntu-latest, 1.65)	2m 21s
clippy_check (ubuntu-latest, stable)	33s
Build and Test (ubuntu-latest, 1.70)	1m 56s
Rustfmt (stable)	11s
clippy_check (ubuntu-latest, nightly)	54s
Build and Test (ubuntu-latest, 1.75)	1m 39s
clippy_check (windows-latest, stable)	1m 0s
Build and Test (ubuntu-latest, stable)	4m 8s
clippy_check (windows-latest, nightly)	1m 39s
Build and Test (ubuntu-latest, beta)	1m 2s
Build and Test (ubuntu-latest, nightly)	1m 50s
Build and Test (windows-latest, 1.65)	3m 36s
Build and Test (windows-latest, 1.70)	2m 59s
Build and Test (windows-latest, 1.75)	3m 5s
Build and Test (windows-latest, stable)	3m 12s
Build and Test (windows-latest, beta)	1m 55s
Build and Test (windows-latest, nightly)	3m 11s
Tests result	1s
	35m 12s

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