feat(client): Added thread-safe update client

[0x676e67]

This pull request includes several changes to improve the functionality and maintainability of the rnet library. The changes focus on enhancing the Client class, adding new functionality, and improving error handling.

Enhancements to Client class:

• Added new methods get_cookies, set_cookies, and update to the Client class in rnet.pyi to manage cookies and update client parameters.
• Modified Client struct to use ArcSwap for thread-safe updates and added new methods to retrieve user agent and headers in src/client.rs. [1] [2]
• Updated HTTP request methods to use the load method of ArcSwap for better performance and thread safety in src/client.rs. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Error handling improvements:

• Added new error handling functions wrap_invali_header_value_error and wrap_url_parse_error in src/error.rs to provide more specific error messages.

New parameter class:

• Introduced UpdateClientParams class in rnet.pyi and src/param/client.rs to encapsulate parameters for updating the client. [1] [2]

Dependency updates:

• Added url dependency in Cargo.toml to support URL parsing.