New operation: `create_constraint` and support unique constraints with multiple columns #2376

Job	Run time
dead code check	10s
validate examples JSON	8s
examples (pg: 14.8, schema: public)	34s
examples (pg: 14.8, schema: non_public)	37s
check ledger	4s
license check	7s
lint	12s
examples (pg: 15.3, schema: public)	34s
examples (pg: 15.3, schema: non_public)	38s
test (pg: 14.8, schema: public)	48s
type generation	10s
examples (pg: 16.4, schema: public)	37s
test (pg: 14.8, schema: non_public)	45s
examples (pg: 16.4, schema: non_public)	33s
test (pg: 15.3, schema: public)	49s
examples (pg: 17.0, schema: public)	31s
examples (pg: 17.0, schema: non_public)	39s
test (pg: 15.3, schema: non_public)	54s
test (pg: 16.4, schema: public)	56s
examples (pg: latest, schema: public)	38s
test (pg: 16.4, schema: non_public)	49s
examples (pg: latest, schema: non_public)	37s
test (pg: 17.0, schema: public)	48s
test (pg: 17.0, schema: non_public)	47s
test (pg: latest, schema: public)	57s
test (pg: latest, schema: non_public)	51s
release	0s
	15m 13s

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