chore: remove hex

[spiral-ladder]

Most of the utils in hex.zig are not being used, and what's left of those used ones (2 of them) are only used in config and test_utils, so we might as well put them where they're used.

This alsos simplifies imports/dependencies for consumer libraries.

[gemini-code-assist]

Summary of Changes

Hello @spiral-ladder, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request undertakes a significant refactoring effort by eliminating the src/hex.zig utility file. The functions previously housed there were either found to be unused and thus removed, or were highly specialized and have been relocated to the specific modules (config and state_transition/test_utils) where they are actually consumed. This change aims to reduce unnecessary dependencies, improve modularity, and simplify the overall build configuration.

Highlights

• Removal of hex.zig module: The dedicated src/hex.zig file has been entirely removed, streamlining the project structure.
• Relocation of hexToBytesComptime: The hexToBytesComptime utility function has been moved to src/config/root.zig as it was primarily used within the configuration files.
• Relocation of hexToBytes and hexToRoot: The hexToBytes and hexToRoot utility functions have been moved to src/state_transition/test_utils/root.zig to serve their specific usage in test utilities.
• Simplified build configuration: The build.zig and zbuild.zon files have been updated to remove references to the hex module and simplify test filter options.

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[gemini-code-assist]

Code Review

This pull request is a nice simplification, removing the hex module and relocating its utilities to where they are used. My review focuses on a few areas to further improve the code: enhancing the safety of the moved functions, suggesting the restoration of a useful developer feature in the build script, and ensuring that test coverage for the moved utilities is maintained. Overall, the changes are positive and improve the project structure.