Replace `Vec<u8>` with a streaming body type / generic type with appropriate bounds about ruma HOT 4 CLOSED

Quick update:

• http-service is deprecated, tide use http_types::Body.
• http-body does not seems really active.
• http::Request allow arbitrary types to represent the HTTP body.

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Status: We're not currently using hyper::Body anymore but Vec<u8> instead. Whether to go with http-service or http-body is still very unclear, but since serde_json currently doesn't support streaming deserialization of a single large json object anyway, we're not likely to see any performance improvements from switching back to a streaming body type.

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Related: The hyper 0.13 announcement post talks about making it easier to make libraries agnostic to HTTP client using Tower as the trait interface. That might end up being the way forward since http_service seems to be DOA.

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Since there's now both http and http-types, and virtually nobody is adopting the http crate as part of their public API, I think we need to go one step further and stop relying on the http crate entirely. I hope it won't be too hard to figure out a decent abstraction for our needs of HTTP requests and responses that can be implemented for all types we care about.

I've opened #389 for that.

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