FFI: get scalars from arrays #6605

Job	Run time
Rust/C++ FFI tests (tsan)	1m 35s
C++ API (coverage)	1m 2s
Rust tests (asan)	4m 53s
Rust tests (tsan)	4m 52s
Rust tests (miri)	1m 36s
Rust/C++ FFI tests (asan)	1m 59s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-1s
DuckDB libraries available in R2	2s
Rust tests (coverage) (tests)	4m 14s
	20m 18s

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