Add empty columns to chunked node group if needed during COPY (#4882) #15382

Job	Run time
python lint check	26s
clang format	38s
sanity checks	10s
rustfmt check	15s
clang tidy & clangd diagnostics check	15m 38s
shell test	14m 15s
rust build & test	4m 16s
generate binary dataset	2m 47s
clang build & test	12m 11s
webassembly build & test	12m 31s
gcc build & test	5m 33s
code coverage	12m 30s
apple clang build & test	3m 40s
msvc build & test	12m 21s
macos extension test	0s
gcc build & test in-mem only with various vector size	0s
gcc build & test with asan	0s
clang build & test with page_size_log2=16	5s
clang build & test with page_size_log2=18	3s
linux extension test	0s
benchmark	0s
report benchmark result	0s
windows extension test	1s
	1h 37m 20s

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