Support the sslmode URL query parameter and UDS URLs #199

Job	Run time
api-breakage	7m 7s
linux-unit (postgres:15, swift:5.7-jammy)	3m 33s
linux-unit (postgres:15, swift:5.8-jammy)	2m 55s
linux-unit (postgres:15, swiftlang/swift:nightly-5.9-jammy)	3m 55s
linux-unit (postgres:15, swiftlang/swift:nightly-main-jammy)	3m 57s
linux-unit (postgres:13, swift:5.7-jammy)	3m 34s
linux-unit (postgres:13, swift:5.8-jammy)	3m 37s
linux-unit (postgres:13, swiftlang/swift:nightly-5.9-jammy)	4m 5s
linux-unit (postgres:13, swiftlang/swift:nightly-main-jammy)	5m 6s
linux-unit (postgres:11, swift:5.7-jammy)	3m 34s
linux-unit (postgres:11, swift:5.8-jammy)	4m 28s
linux-unit (postgres:11, swiftlang/swift:nightly-5.9-jammy)	5m 30s
linux-unit (postgres:11, swiftlang/swift:nightly-main-jammy)	3m 50s
linux-integration (postgres:15, scram-sha-256, swift:5.7-jammy)	4m 30s
linux-integration (postgres:15, scram-sha-256, swift:5.8-jammy)	3m 25s
linux-integration (postgres:15, scram-sha-256, swiftlang/swift:nightly-5.9-jammy)	4m 49s
linux-integration (postgres:15, scram-sha-256, swiftlang/swift:nightly-main-jammy)	4m 17s
macos-unit (postgresql@14, scram-sha-256, macos-13, latest-stable)	3m 0s
	1h 15m 12s

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