smithy-rs

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here -->
* https://github.com/smithy-lang/smithy-rs/issues/3710
* https://github.com/smithy-lang/smithy-rs/issues/1925
* https://github.com/awslabs/aws-sdk-rust/issues/977


## Description
Updates the default HTTPS client to be based off hyper 1.x, rustls, and
aws-lc. See the GitHub discussion:
https://github.com/awslabs/aws-sdk-rust/discussions/1257

This PR is a rollup of previously reviewed PRs:

* Refactor the runtime structure and consolidate HTTP client
implementation(s):
[smithy-rs#3866](https://github.com/smithy-lang/smithy-rs/pull/3866)
* Migrate HTTP test utils:
[smithy-rs#3888](https://github.com/smithy-lang/smithy-rs/pull/3888)
* Update runtime to use new test utils:
[smithy-rs#3898](https://github.com/smithy-lang/smithy-rs/pull/3898)
* Backport connection poisoning:
[smithy-rs#3795](https://github.com/smithy-lang/smithy-rs/pull/3795)
* Deprecate HTTP 02x presign APIs:
[smithy-rs#3823](https://github.com/smithy-lang/smithy-rs/pull/3823)
* Enable hyper1 as default client: [smithy-rs#]()
* Enable hyper1 behind
BMV:[smithy-rs#3973](https://github.com/smithy-lang/smithy-rs/pull/3973)
* s2n-tls provider (by Sam):
[smithy-rs#3965](https://github.com/smithy-lang/smithy-rs/pull/3965)
* custom TLS config:
[smithy-rs#4032](https://github.com/smithy-lang/smithy-rs/pull/4032

)

## Testing
<!--- Please describe in detail how you tested your changes -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->

## Checklist
<!--- If a checkbox below is not applicable, then please DELETE it
rather than leaving it unchecked -->
- [x] For changes to the smithy-rs codegen or runtime crates, I have
created a changelog entry Markdown file in the `.changelog` directory,
specifying "client," "server," or both in the `applies_to` key.
- [x] For changes to the AWS SDK, generated SDK code, or SDK runtime
crates, I have created a changelog entry Markdown file in the
`.changelog` directory, specifying "aws-sdk-rust" in the `applies_to`
key.

----

_By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice._

---------

Co-authored-by: Sam Clark <3758302+goatgoose@users.noreply.github.com>
Co-authored-by: Landon James <lnj@amazon.com>