Implement `get_keys` function in fts #14554

Job	Run time
sanity checks	12s
sanity checks	12s
python lint check	25s
python lint check	25s
clang format	37s
clang format	37s
rustfmt check	14s
rustfmt check	14s
shell test	15m 50s
shell test	15m 50s
clang tidy & clangd diagnostics check	28m 9s
clang tidy & clangd diagnostics check	28m 9s
rust build & test	12m 37s
rust build & test	12m 37s
generate binary dataset	1m 11s
generate binary dataset	1m 11s
gcc build & test	12m 37s
gcc build & test	12m 37s
clang build & test	15m 45s
clang build & test	15m 45s
apple clang build & test	9m 14s
apple clang build & test	9m 14s
code coverage	32m 18s
code coverage	32m 18s
msvc build & test	33m 22s
msvc build & test	33m 22s
webassembly build & test	15m 11s
webassembly build & test	15m 11s
macos extension test	2m 10s
macos extension test	2m 10s
gcc build & test with asan	38m 20s
gcc build & test with asan	38m 20s
gcc build & test in-mem only with various vector size	4m 13s
gcc build & test in-mem only with various vector size	4m 13s
linux extension test	2m 59s
linux extension test	19m 56s
clang build & test with page_size_log2=16	3m 50s
clang build & test with page_size_log2=16	3m 50s
clang build & test with page_size_log2=18	5m 17s
clang build & test with page_size_log2=18	5m 17s
benchmark / benchmark	15m 15s
benchmark / benchmark	15m 15s
report benchmark result	3s
report benchmark result	3s
windows extension test	7m 12s
windows extension test	7m 12s
	8h 50m 59s

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