Split `TableStrategy` dispatcher from `StructStrategy` #4781

Job	Run time
Rust tests (asan)	6m 50s
Rust/C++ FFI tests (asan)	2m 15s
Rust tests (miri)	1m 38s
Rust/C++ FFI tests (tsan)	1m 59s
Rust tests (tsan)	6m 26s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	8s
DuckDB libraries available in R2	2s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-1s
Rust tests (coverage) (tests)	6m 41s
	25m 58s

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