refactor(client): refactor client HTTP1/HTTP2 configuration API

[0x676e67]

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[0x676e67]

This pull request includes significant changes to the rquest library, focusing on refactoring and enhancing the HTTP/1 and HTTP/2 configuration capabilities. The most important changes include the introduction of Http1Builder and Http2Builder structs, updates to the client builder methods, and adjustments to the WebSocketRequestBuilder.

Enhancements to HTTP/1 and HTTP/2 Configuration:

• examples/impersonate_settings.rs: Added Http1Builder and Http2Builder to the imports and configured the client to use these builders for HTTP/1 and HTTP/2 settings. [1] [2] [3]

• src/client/http.rs: Updated the ClientBuilder methods to use the new http1 and http2 methods instead of the previous with_http1_builder and with_http2_builder methods. [1] [2] [3] [4] [5]

• src/util/client/mod.rs: Introduced Http1Builder and Http2Builder structs with Deref and DerefMut implementations, and added corresponding methods in the Builder struct to return these builders. [1] [2] [3]

Codebase Simplification:

• src/client/http.rs: Simplified the apply_http2_settings function to use Http2Builder directly.

WebSocket Request Builder Adjustments:

• src/client/websocket/mod.rs: Moved the with_builder method to a different location within the WebSocketRequestBuilder implementation to improve code organization. [1] [2]

Additional Imports and Utility Methods:

• src/lib.rs: Exported Http1Builder and Http2Builder from the util::client module.
• src/util/client/mod.rs: Added necessary imports for Deref and DerefMut traits.