perf(duckdb): push down list length expressions #4422

Job	Run time
Rust tests (miri)	1m 36s
Rust tests (asan)	6m 56s
Rust/C++ FFI tests (tsan)	2m 6s
Rust tests (tsan)	6m 28s
Rust/C++ FFI tests (asan)	2m 25s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	7s
DuckDB libraries available in R2	5s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
Rust tests (coverage) (tests)	6m 16s
	25m 59s

Provide feedback