Parallel distinct hash aggregate #15356

Job	Run time
sanity checks	11s
clang format	36s
python lint check	37s
rustfmt check	13s
rust build & test	2m 40s
clang tidy & clangd diagnostics check	40m 33s
shell test	13m 54s
generate binary dataset	1m 41s
gcc build & test	15m 2s
clang build & test	14m 36s
apple clang build & test	9m 32s
code coverage	34m 41s
msvc build & test	39m 58s
webassembly build & test	21m 26s
macos extension test	2m 14s
clang build & test with page_size_log2=16	4m 40s
clang build & test with page_size_log2=18	7m 16s
linux extension test	25m 50s
gcc build & test with asan	1h 15m 16s
gcc build & test in-mem only with various vector size	27m 15s
benchmark / benchmark	12m 40s
report benchmark result	7s
windows extension test	9m 11s
	6h 0m 9s

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