FFI: get scalars from arrays #6608

Job	Run time
C++ API (coverage)	1m 18s
Rust tests (miri)	1m 34s
Rust/C++ FFI tests (tsan)	2m 32s
Rust tests (tsan)	6m 36s
Rust/C++ FFI tests (asan)	24s
Rust tests (asan)	6m 57s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
DuckDB libraries available in R2	2s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
Rust tests (coverage) (tests)	17s
Rust/C++ FFI tests (asan)	2m 13s
C++ API (coverage)	1m 18s
Rust tests (miri)	1m 34s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-776s
DuckDB libraries available in R2	2s
Rust tests (coverage) (tests)	6m 36s
Rust tests (asan)	6m 57s
Rust tests (tsan)	6m 36s
Rust/C++ FFI tests (tsan)	2m 32s
	34m 44s

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