bindings/go Support blob types in query arguments, free non-gc allocations #822
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This PR fixes/adds support for the Blob type and adds the appropriate tests.
Types created on the Go side will be cleaned up rather quickly if nothing is referencing them, so this approach uses
runtime.Pinner
to pin the bytes in memory so the pointers will be valid when Rust usesfrom_raw_parts
and then owns a new vec. They are then cleaned up after the FFI call withpinner.Unpin
.