FSST: decompress straight into the builder's byte storage #6622

Job	Run time
C++ API (coverage)	1m 19s
Rust tests (tsan)	6m 37s
Rust tests (asan)	6m 56s
Rust/C++ FFI tests (asan)	2m 7s
Mirror DuckDB to R2 / Resolve DuckDB version and check R2	6s
Rust/C++ FFI tests (tsan)	1m 56s
Rust tests (miri)	1m 35s
Mirror DuckDB to R2 / Mirror DuckDB ${{ matrix.archive }} to R2	0s
DuckDB libraries available in R2	2s
Rust tests (coverage) (tests)	6m 41s
	27m 19s

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