feat(pageserver): separate sparse and dense keyspace #20486

Job	Run time
check-permissions / check-permissions	1s
tag	12s
cancel-previous-e2e-tests	3s
check-build-tools-image / check-image	6s
build-build-tools-image / check-image / check-image	2s
trigger-custom-extensions-build-and-wait	5m 52s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
build-neon (debug)	10m 8s
check-codestyle-python	29s
check-codestyle-rust	15m 28s
build-neon (release)	12m 5s
compute-node-image (v14)	6m 49s
get-benchmarks-durations	0s
compute-node-image (v15)	7m 12s
neon-image	10m 25s
compute-node-image (v16)	6m 26s
vm-compute-node-image (v14)	1m 19s
vm-compute-node-image (v15)	1m 27s
vm-compute-node-image (v16)	1m 31s
test-images	3m 24s
regress-tests (debug, v14)	19m 8s
regress-tests (debug, v15)	18m 52s
regress-tests (debug, v16)	18m 26s
benchmarks	0s
regress-tests (release, v14)	11m 12s
regress-tests (release, v15)	10m 26s
regress-tests (release, v16)	10m 21s
promote-images	1m 12s
trigger-e2e-tests / tag	9s
trigger-e2e-tests / cancel-previous-e2e-tests	2s
trigger-e2e-tests / trigger-e2e-tests	16s
coverage-report (debug)	4m 45s
promote-compatibility-data	0s
deploy	0s
pin-build-tools-image	0s
create-test-report	1m 57s
	2h 59m 45s

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