FFI: get scalars from arrays #6600

Job	Run time
C++ API (coverage)	56s
Rust tests (miri)	1m 34s
Rust tests (tsan)	2m 12s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
Rust/C++ FFI tests (tsan)	1m 31s
Rust/C++ FFI tests (asan)	1m 24s
Rust tests (asan)	2m 13s
DuckDB libraries available in R2	4s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
Rust tests (coverage) (tests)	1m 51s
	11m 51s

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