[Feature Request] support iot credential provider

[stuart-warren]

it would be great to be able to point to AWS iot thing TLS credentials and for this helper to also perform the iot credential provider dance first

https://aws.amazon.com/blogs/security/how-to-eliminate-the-need-for-hardcoded-aws-credentials-in-devices-by-using-the-aws-iot-credentials-provider/

My assumption is that there would need to be a standard config file or env vars containing:

• ca cert
• thing cert
• thing key pair
• thing name
• role alias
• some details to build the endpoint address

[xyklex]

I'm looking for this one too, I want to allow devices to pull images from ECR using only their certificates