Extending hyper::body::Body to More Native Types

[akneni]

This poll regards the issue #3746.

Issue:

Currently, the 'String' is the only native data type that implements hyper::body::Body.
If we're passing other data types as a body, we need to add the http_body_util crate and add a little bit of boiler plate when building our request.

use http_body_util::Full;

let some_bytes = vec![0_u8, 1, 2];
let mut req = Request::builder()
    .method("POST")
    .body(Full::<Bytes>::from(some_bytes))
    .unwrap();

Note: While the request builder itself may not require the body to implement the Body trait, both the sender and connection returned by http1::handshake require the request's body to implement it.

With the body trait implemented for Vec<u8> (just one example that probably should implement body) we could leave out the http_body_util crate. Building a request would also become more intuitive and ergonomic.

    let some_bytes = vec![0_u8, 1, 2];
    let mut req = Request::builder()
        .method("POST")
        .body(some_bytes)
        .unwrap();

Some think that this would make this functionality more intuitive, and save the user from having to import an additional crate, but others prefer the explicitness of using Full.

Please let us know your preference! Your feedback is crucial to making an informed decision that best serves the community!