Add parallel k-core implementation #14746

Job	Run time
sanity checks	10s
sanity checks	10s
clang format	47s
clang format	47s
python lint check	38s
python lint check	38s
rustfmt check	13s
rustfmt check	13s
clang tidy & clangd diagnostics check	12m 8s
clang tidy & clangd diagnostics check	12m 8s
shell test	13m 14s
shell test	13m 14s
rust build & test	10m 37s
rust build & test	10m 37s
generate binary dataset	1m 32s
generate binary dataset	1m 32s
clang build & test	15m 37s
clang build & test	15m 37s
code coverage	32m 25s
code coverage	32m 25s
gcc build & test	13m 45s
gcc build & test	13m 45s
apple clang build & test	19m 44s
apple clang build & test	19m 44s
webassembly build & test	18m 0s
webassembly build & test	18m 0s
msvc build & test	34m 2s
msvc build & test	34m 2s
clang build & test with page_size_log2=16	4m 39s
clang build & test with page_size_log2=16	4m 39s
clang build & test with page_size_log2=18	8m 26s
clang build & test with page_size_log2=18	8m 26s
gcc build & test with asan	40m 24s
gcc build & test with asan	40m 24s
gcc build & test in-mem only with various vector size	4m 34s
gcc build & test in-mem only with various vector size	4m 34s
linux extension test	17m 59s
linux extension test	17m 59s
benchmark / benchmark	13m 2s
benchmark / benchmark	12m 40s
macos extension test	2m 43s
macos extension test	2m 43s
report benchmark result	0s
report benchmark result	10s
windows extension test	7m 58s
windows extension test	7m 58s
	9h 5m 2s

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