Add a newer `Zstd` module for Swift use, with a more idiomatic API, plus nullability annotations#4665

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wadetregaskis wants to merge 11 commits into

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Commits on May 20, 2026

Added Swift's ".build" folder to the ignore list.
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Added ".swiftpm/xcode/" to the ignore list.
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Added the `Zstd` Swift module, with a nicer API (for Swift) than the existing `libzstd`.
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Improved `dump-api.sh` to include type information as well.
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Added nullability annotations.
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Added nullability annotations for all the remaining parts.
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Some fixes for nullability annotations, for the amalgamated headers.
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Added nullability annotations for the various functions which actually need it.
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Suppress the warnings about using Clang's nullability extensions.
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Added `zstd_annotations.h` to all the _other_ build systems.
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Added `zstd_annotations.h` to the file copy list in `build_library_test.sh` and `freestanding.py`.
wadetregaskis
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