refactor: HTTP/3 handler and server logic

[Chahine-tech]

This pull request primarily removes redundant comments across various files to improve code readability and maintainability. The changes span multiple HTTP/3-related modules and focus on cleaning up comments that restate the code's functionality or provide unnecessary explanations.

Removal of redundant comments:

src/adapters/file_system.rs:

• Removed a comment explaining the equivalence of two instantiation methods in the test_default_construction test.

src/adapters/http/server.rs:

• Removed comments describing basic functionality, such as RAII guards, shared state definitions, cloning operations, and error handling improvements. [1] [2] [3] [4] [5]

src/adapters/http3/config.rs:

• Removed comments explaining QUIC configuration steps, including application protocol setup, flow control, congestion control, and certificate loading. [1] [2] [3] [4]

src/adapters/http3/connection.rs:

• Removed comments describing HTTP/3 connection setup, response handling, and connection management logic. [1] [2] [3] [4]

src/adapters/http3/handler.rs:

• Removed comments explaining HTTP/3 request and response processing, header conversion, and proxy service routing. [1] [2] [3] [4]

src/adapters/http3/server.rs:

• Removed comments describing UDP socket creation, QUIC packet processing, and HTTP/3 event handling. [1] [2] [3] [4]

Test files:

• Removed comments in test files (src/adapters/http3/config.rs, src/adapters/http3/server.rs, src/adapters/http3/tests.rs) that redundantly describe test setups and expected outcomes. [1] [2] [3] [4] [5] [6] [7]