feat(resp): Expose Streamer as public API

[0x676e67]

This pull request includes several changes to the Response class and related files to improve type safety and performance. The most important changes include modifying the stream method to return a Streamer type, adding the Streamer class to the module, and optimizing getter methods for the Response class.

Changes to type safety and method signatures:

• rnet.pyi: Modified the stream method in the Response class to return a Streamer type instead of typing.Any.
• src/resp.rs: Updated the stream method in the Response class to return a Streamer instance.

Module and class additions:

• src/lib.rs: Added the Streamer class to the module.
• src/lib.rs: Updated the import statement to include the Streamer class.

Performance optimizations:

• src/resp.rs: Added #[inline(always)] attribute to several getter methods in the Response class for performance improvement. [1] [2] [3] [4] [5] [6] [7]