Add DefaultAwsSecurityCredentialsSupplier supporting AWS default credentials chain

[dnl-trpp]

Is your feature request related to a problem? Please describe.
The current InternalAwsSecurityCredentialsSupplier does not support all AWS authentication methods and depends on an AWSCredentialSource. In many cases, it would be useful to have a built-in implementation that leverages the AWS Default Credentials provider chain.

Describe the solution you'd like
A full implementation, similar to the one shown in this sample, could be added as a separate class (e.g., DefaultAwsSecurityCredentialsSupplier) that uses the default AWS credential resolution logic.