The three public CCtx parameter APIs were still implemented as C bodies that
only forwarded into Rust symbols. Move ownership of those leaves to the Rust
ABI by using the existing public C symbol names directly, while retaining the
same signatures, behavior, and linker-visible API names. The neighboring C
helpers remain because they carry C-owned configuration or private-state
adaptation rather than being pure public forwarders.
Test Plan:
- `cargo +nightly fmt --manifest-path rust/Cargo.toml --all -- --check` -- passed.
- `cc -fsyntax-only -Ilib -Icommon lib/compress/zstd_compress.c` -- passed.
- `git diff --check` and `git diff --cached --check` -- passed.
- Heavy cargo, make, and test commands were intentionally not run per scope.
ddidderr
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