[request]: Add request temporary credentials by x.509 and certificate and iot role alias.

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### Tell us about your request

Add request temporary credentials by x.509 and certificate and iot role alias.
refer to this [blog](https://fanchenbao.medium.com/access-aws-s3-bucket-from-aws-iot-thing-in-python3-1ca828456e55).

Thanks.

### Tell us about the problem you're trying to solve.

Request temporary credentials by x.509 and certificate and iot role alias.

### Are you currently working around this issue?

yes

### Additional context

_No response_

Start by reading the linked blog and determine the AWS IoT certificate, X.509, and role-alias flow the SDK would need to support. The issue does not name files, tests, or an entry point; done would require a defined implementation scope and working temporary-credential requests through that flow.

Written by the indexing model from the issue text.