IMDS retries

[landonxjames]

Motivation and Context

Addressing awslabs/aws-sdk-rust#1233

Description

Add ability to configure the retry classifier on the IMDS client.

Testing

Added new unit test to ensure that a user defined retry classifer is being used.

Checklist

• 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.

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Client Test
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[aajtodd]

I realize this is still in draft so take feedback with grain of salt.

I'm wondering if we shouldn't expose the ability to customize the ImdsResponseRetryClassifier so that users don't have to start from scratch when creating a client.

e.g. (with some pseudo code)

let imds = aws_config::imds::client::builder()
      .with_retry_classifier(
           ImdsResponseRetryClassifer::default()
               .with_retry_connect_timeouts(true)   // new API(s) to customize from the default we use today
      )
      ...
      .build()

Or if we are super paranoid keep it hidden and just add new options to the client builder for this behavior but I think I'd be ok either way.

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• AWS SDK (ignoring whitespace)
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• No codegen difference in the Server Test
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[github-actions]

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• AWS SDK (ignoring whitespace)
• No codegen difference in the Client Test
• No codegen difference in the Server Test
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[github-actions]

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• AWS SDK (ignoring whitespace)
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• No codegen difference in the Server Test
• No codegen difference in the Server Test Python
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[github-actions]

A new generated diff is ready to view.

• AWS SDK (ignoring whitespace)
• No codegen difference in the Client Test
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python
• No codegen difference in the Server Test Typescript

A new doc preview is ready to view.