STS duration seconds ENVIRONMENT Variable

### Describe the feature

An ENVIRONMENT variable to set the STS duration seconds, such as:
- `AWS_ROLE_SESSION_DURATION_SECONDS`

### Use Case

Imagine engineers wanting to use ENVIRONMENT variables for STS Assume Role/Assume Role with Web Identity and we want to override the default duration (seconds), there's already environment variables for:
- `AWS_ROLE_ARN`
- `AWS_ROLE_SESSION_NAME`
- `AWS_WEB_IDENTITY_TOKEN_FILE`

In a CI/CD Pipeline (GitLab OIDC AWS Authentication), to reduce the amount of code, keeping the codebase simple and slim no need to call aws CLI sts commands but rather use environment variables - from a platform engineering/operational perspective easier to support and maintain.

- https://awscli.amazonaws.com/v2/documentation/api/latest/topic/config-vars.html#:~:text=be%20automatically%20generated.-,duration_seconds,-%2D%20The%20duration%2C%20in
- https://docs.aws.amazon.com/cli/latest/reference/sts/assume-role-with-web-identity.html#:~:text=for%20the%20role.-,This%20setting%20can%20have%20a%20value%20from%201%20hour%20to%2012%20hours,-.%20To%20learn%20how

.... however there is no environment variable to set `duration-seconds`, nothing shows up in this repository seemingly to suggest it's supported.

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CLI version used

Pulling docker image amazon/aws-cli:latest ...

### Environment details (OS name and version, etc.)

Mac OS Python/3.10.6 Darwin/22.1.0 source/x86_64