fix(proxy): Update proxy creation instructions and fix all methods

[0x676e67]

This pull request includes updates to the Proxy implementation in the src/types/proxy.rs file. The changes primarily focus on enhancing the documentation and modifying the proxy creation methods.

Documentation improvements:

• Added detailed comments to the methods for setting up HTTP and HTTPS proxy servers, explaining their purpose and usage. [1] [2]

Method updates:

• Updated the method to create a proxy server for all protocols, including HTTP and HTTPS, and revised the corresponding docstring.
• Modified the static method all to use rquest::Proxy::all instead of rquest::Proxy::https for creating a proxy for all types of requests.