refactor: Split core traversal impls into modules

[tisonkun]

Summary

• Move built-in traversal implementations out of lib.rs into focused impls modules.
• Keep shared trivial traversal helper macros in impls/mod.rs.
• Leave public APIs and implementation behavior unchanged.

Tests

• cargo x lint --fix
• cargo x test --no-capture

[Copilot]

Pull request overview

Refactors the traversable crate’s internal built-in Traversable/TraversableMut implementations by moving them out of lib.rs into dedicated impls/* modules, keeping the public API surface and traversal behavior unchanged while improving maintainability.

Changes:

• Removed the inline built-in impl modules/macros from traversable/src/lib.rs.
• Added focused implementation modules for tuples, trivial primitives, and std types under traversable/src/impls/.
• Centralized shared helper macros (blank_traverse_impl!, trivial_traverse_impl!) in traversable/src/impls/mod.rs and wired module inclusion via feature flags.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
traversable/src/lib.rs	Removes inlined built-in impl modules/macros and keeps the crate’s core traits/public API focused.
traversable/src/impls/mod.rs	Defines shared traversal helper macros and declares impl submodules (feature-gated where appropriate).
traversable/src/impls/tuple.rs	Rehomes tuple Traversable/TraversableMut implementations.
traversable/src/impls/trivial.rs	Rehomes primitive/unit trivial traversal implementations, preserving traverse-trivial gating.
traversable/src/impls/std_primary.rs	Rehomes std “primary” type implementations (e.g., String) with traverse-std gating.
traversable/src/impls/std_container.rs	Rehomes std container implementations (iterable containers, Box, Arc, locks, Cell, etc.).

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