feat: Add HTTP/2 support for WebSocket

[0x676e67]

close: #369

[0x676e67]

This pull request introduces several changes to the Cargo.toml file and multiple example files to incorporate the tracing library for logging, adds a new example for HTTP/2 WebSocket, and refactors the client request code to include protocol handling.

Dependency Updates:

• Added tracing, tracing-subscriber, and env_logger dependencies to Cargo.toml to enhance logging capabilities.

Example Code Updates:

• Replaced env_logger with tracing_subscriber for logging initialization across various example files to provide more flexible and structured logging. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

New Example:

• Added a new example http2_websocket.rs to demonstrate WebSocket communication over HTTP/2, including setting up the client and handling messages.

Client Request Refactor:

• Updated the Request struct and related methods to handle the new protocol field, allowing for better protocol management in client requests. [1] [2] [3] [4]
• Modified http.rs to pass the protocol information when building requests, ensuring the correct protocol is used during execution. [1] [2] [3] [4]

WebSocket Enhancements:

• Introduced a Ver enum in websocket/mod.rs to identify the version of the connection, supporting both HTTP/1 and HTTP/2. [1] [2]