refactor: noop - dedup, cleanup, new type abstraction

[nyurik]

There are no changes to the generator output, just some minor refactoring to optimize the code structure, break giant lib.rs into a few more files, and de-duplicate feature-gated code gen.

As part of the refactoring, there is now an enum representing signal's type - removing the need to deal with type strings.

[codecov]

Codecov Report

❌ Patch coverage is 83.42697% with 59 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/lib.rs	70.62%	3 Missing and 44 partials ⚠️
src/signal_type.rs	94.26%	6 Missing and 3 partials ⚠️
src/feature_config.rs	84.21%	1 Missing and 2 partials ⚠️

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[Copilot]

Pull request overview

Refactors the Rust code generator internals to reduce duplicated feature-gated emission and move common naming/sanitization helpers into dedicated modules, with the intention of keeping generated output unchanged.

Changes:

• Introduces FeatureConfig helper module to centralize feature gating (fmt_cfg/fmt_attr) logic.
• Adds utils module with MessageExt/SignalExt naming helpers and shared sanitization functions.
• Refactors parts of lib.rs to use new helpers and reduce duplicated code paths.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/lib.rs	Uses new FeatureConfig/utils helpers and refactors feature-gated codegen emission.
src/feature_config.rs	New module encapsulating feature gating / cfg emission helpers.
src/utils.rs	New module centralizing message/signal naming/sanitization utilities.

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