Move re-exports into types and re-export AggregatedBytes

[jdisanti]

Motivation and Context

This implements #944.

Checklist

• I have updated CHANGELOG.next.toml if I made changes to the smithy-rs codegen or runtime crates
• 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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[jdisanti]

Opening this PR as a draft to gather feedback. This change will also require updating all the examples, which I want to hold off on until consolidation is complete.

Open questions:

1. Should the re-exported SdkError type follow other re-exports and be in the types module, or should it remain in root?
2. Should we re-export types even if they're not used? For example, should ByteStream be re-exported by a service that has no streaming operations?

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[Velfi]

• Should the re-exported SdkError type follow other re-exports and be in the types module, or should it remain in root?

I like setting and sticking to conventions so putting it in types makes sense to me unless that somehow makes codegen more difficult.

• Should we re-export types even if they're not used? For example, should ByteStream be re-exported by a service that has no streaming operations?

On first thought, I think it shouldn't be re-exported. However, I'm worried about SDKs that add and then remove a bytestream based api. Is that something we need to consider or will that never happen?

[rcoh]

generally APIs can't be removed

[jdisanti]

Will proceed with:

1. All re-exports go into the types namespace
2. Don't re-export unused types

Will also make Config and Client #[doc(inline)] to pull them into the structs section of the docs.

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[jdisanti]

Examples fixed in awsdocs/aws-doc-sdk-examples#2776

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