Zstd: append values in bulk and harden the frame metadata reads #6623

Job	Run time
C++ API (coverage)	1m 20s
Rust tests (miri)	1m 36s
Rust/C++ FFI tests (asan)	2m 11s
Rust tests (tsan)	6m 41s
Rust/C++ FFI tests (tsan)	1m 53s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	7s
Rust tests (asan)	7m 3s
DuckDB libraries available in R2	3s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	-1s
Rust tests (coverage) (tests)	6m 48s
	27m 41s

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