refactor(h2): refactor legacy unsafe wrapper code

[0x676e67]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors legacy unsafe wrapper code in the HTTP/2 implementation by removing unsafe memory transmutation patterns and simplifying the type system. The changes eliminate the UpgradedSendStream wrapper and its associated unsafe Neutered type, replacing them with direct usage of the underlying SendStream type.

• Removes unsafe memory transmutation code in UpgradedSendStream and Neutered types
• Updates function calls to use send_data instead of the wrapper's write method
• Adds Send trait bounds to ensure type safety without unsafe code

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/lib.rs	Adds commented deny directive for unsafe code
src/core/client/proto/h2/mod.rs	Removes unsafe wrapper types and updates method calls
src/core/client/proto/h2/client.rs	Updates type usage and adds Send trait bounds
src/core/client/dispatch.rs	Adds Send trait bound for body data

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}