feat(header): adapt multiple value sequences of key mapping

[0x676e67]

No description provided.

[Copilot]

Pull Request Overview

This PR adapts header handling by introducing support for multiple value sequences of key mapping. Key changes include:

• Exposing a new iterator (HeaderMapValuesIter) in the public API.
• Adding a new method get_all to retrieve all header values for a given key.
• Updating imports and class registrations to support the new iterator.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/typing/mod.rs	Reordered exports and exposed HeaderMapValuesIter to support multiple value sequences.
src/typing/headers.rs	Added get_all and refactored items; implemented the new HeaderMapValuesIter iterator.
src/lib.rs	Updated imports and registered HeaderMapValuesIter with the module.

Comments suppressed due to low confidence (1)

src/typing/headers.rs:165

• Using pop() in the next method returns values in reverse order compared to their original insertion order; consider using an index-based iteration approach if preserving the natural order is required.

slf.inner.pop()