new feature: support AWS Container credential provider

### Feature Description

via `AWS_CONTAINER_CREDENTIALS_RELATIVE_URI` environment variable in ECS/container settings: see https://docs.aws.amazon.com/sdkref/latest/guide/feature-container-credentials.html

### Problem and Solution

load credentials in ecs environment

### Additional Context

_No response_

### Are you willing to contribute to the development of this feature?

- [ ] Yes, I am willing to contribute to the development of this feature.

Start with the AWS container credentials documentation at https://docs.aws.amazon.com/sdkref/latest/guide/feature-container-credentials.html and the AWS_CONTAINER_CREDENTIALS_RELATIVE_URI environment variable described in the issue. Trace how OpenDAL currently loads credentials in ECS-like environments; done means credentials are loaded through this container provider.

Written by the indexing model from the issue text.