Add http = "1.0" support to the `http` request wrapper (#3373)

## Motivation and Context
- aws-sdk-rust#977
- smithy-rs#3365

## Description
Add `try_from` and `try_into` for HTTP 1.x to the HTTP request/response
wrapper. This is a stepping stone en route to supporting Hyper 1.0

## Testing
- [x] New unit tests

## 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>