[request]: Add support for the external-process credential provider

[rcoh]

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Tell us about your request
Add support for the external process credential provider: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-sourcing-external.html

• usable directly
• loaded from ~/.aws/config via credential_process = ...

Are you currently working around this issue?
How are you currently solving this problem?

• Registering a custom named provider
• implementing my own credentials file provider

Additional context
Anything else we should know?

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[jszwedko]

Hi all! Just wondering if there is an external roadmap that I could check to see if this feature is on. We (https://github.com/vectordotdev/vector) have some users that we're relying on rusoto's credential_process support to have Hashicorp's Vault provide credentials.

[jszwedko]

Started a PR for this here: smithy-lang/smithy-rs#1356

[github-actions]

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