Add support for constructing sdk body types from http-body 1.0 (#3300)

## Motivation and Context
- aws-sdk-rust#977


## Description
The first of several PRs to make add support for Hyper 1.0. This minimal
change allows the use of Hyper 1.0 bodies although it does not actually
leverage Hyper 1.0.

## Testing
- Unit test suite
- Ran cargo hack check --feature-powerset because we had a lot of
features. I found a couple of issues.


## Checklist
<!--- If a checkbox below is not applicable, then please DELETE it
rather than leaving it unchecked -->
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the
smithy-rs codegen or runtime crates
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the AWS
SDK, generated SDK code, or SDK runtime crates

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Co-authored-by: John DiSanti <jdisanti@amazon.com>