Make it easy to call API Gateway `Execute` and AMP `RemoteWrite`

[jdisanti]

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Describe the feature

These operations are unmodeled and need to be called manually. Currently, this means people have to resolve credentials and use aws-sigv4 directly with hyper, with is difficult to get working and not a good dev experience.

Ideally, it would be trivial to call these operations from the existing SDK crates.

Use Case

See https://github.com/awslabs/aws-sdk-rust/discussions/923#discussioncomment-7470457

Proposed Solution

The machinery for making this easier exists already with the Operation struct in aws-smithy-runtime. It just needs a method added to trivially set up SigV4, and documentation. Then it could be re-exported from API Gateway and AMP, and have examples added.

Other Information

No response

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

A note for the community

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