Support client side SDK metrics (aws_csm)

[kyleip]

Describe the feature

It looks like the aws rust sdk is not emitting client side SDK metrics when the AWS_CSM_ENABLED environment variable is set. This is the behavior for other aws sdks, such as for [python] (https://boto3.amazonaws.com/v1/documentation/api/1.10.46/guide/sdk-metrics.html) and [go] (https://docs.aws.amazon.com/sdk-for-go/api/aws/csm/).

Use Case

We would like to be able to use aws_csm with the aws rust sdk

Proposed Solution

No response

Other Information

No response

Acknowledgements

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

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[ysaito1001]

I suspect the requested functionality follows smithy-lang/smithy-rs#3912.