Implement confidential statement #15379

Job	Run time
clang format	49s
sanity checks	12s
rustfmt check	11s
python lint check	33s
rust build & test	6m 4s
clang tidy & clangd diagnostics check	30s
shell test	11m 14s
generate binary dataset	3m 3s
webassembly build & test	4m 13s
gcc build & test	3m 33s
clang build & test	3m 36s
code coverage	31s
msvc build & test	6m 45s
apple clang build & test	24s
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=${{ matrix.page_size_log2 }}	0s
linux extension test	0s
benchmark	0s
report benchmark result	0s
windows extension test	0s
	41m 38s

Provide feedback