Add missing feature gate for reverse mappings in PHF implementation

[krobbi]

User description

Previously the library would not compile with PHF enabled and default features disabled due to missing constants in the PHF implementation of get_extensions. This adds the feature gate found in the binary search implementation.

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PR Type

Bug fix

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Description

• Add missing rev-map feature gate to PHF implementation

• Fix compilation error when PHF enabled with default features disabled

• Align PHF implementation with binary search implementation

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Diagram Walkthrough

flowchart LR
  A["PHF Implementation"] -- "add feature gate" --> B["get_extensions function"]
  B -- "matches" --> C["Binary Search Implementation"]

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File Walkthrough

	Relevant files
Bug fix	impl_phf.rs Add feature gate to get_extensions function                            src/impl_phf.rs Add #[cfg(feature = "rev-map")] attribute to get_extensions function Ensures compilation compatibility when PHF is enabled without default features +1/-0

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[qodo-free-for-open-source-projects]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Feature Gate Ensure all call sites and public exports expect get_extensions to exist only when the rev-map feature is enabled, and that other implementations are gated consistently. Validate build across feature combinations (e.g., phf only, phf+rev-map). #[cfg(feature = "rev-map")] pub fn get_extensions(toplevel: &str, sublevel: &str) -> Option<&'static [&'static str]> {

[qodo-free-for-open-source-projects]

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