Adapt c-hash-sig for kagome-crates integration

[kamilsa]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the build script to extract C binding generation logic into a shared build-helper crate, and renames the package from pq-bindings-c-rust to c_hash_sig_crust.

Key changes:

• Simplified build.rs by delegating cbindgen logic to an external build-helper crate
• Renamed package from pq-bindings-c-rust to c_hash_sig_crust in Cargo.toml
• Replaced direct cbindgen dependency with a path dependency on build-helper

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
build.rs	Replaced inline cbindgen configuration with a call to build_helper::run_cbindgen()
Cargo.toml	Renamed package and replaced cbindgen build dependency with build-helper path dependency

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