Add `hasNext` and `hasPrevious` properties #1029

Job	Run time
linux-integration-sqlite	2m 9s
linux-integration-mongo	3m 12s
linux-integration-psql	3m 45s
linux-integration-mysql	3m 21s
unit-tests / api-breakage	2m 37s
unit-tests / linux-unit (swift:5.8-jammy)	1m 44s
unit-tests / linux-unit (swift:5.9-jammy)	2m 5s
unit-tests / macos-unit (macos-13, ~15.2)	2m 35s
unit-tests / macos-unit (macos-14, latest-stable)	1m 56s
unit-tests / linux-unit (swift:5.10-noble)	2m 29s
unit-tests / linux-unit (swift:6.0-noble)	2m 10s
unit-tests / linux-unit (swiftlang/swift:nightly-main-jammy)	2m 24s
	30m 27s

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