Add AWS session token to credentials

[durbon]

Congratulation for the project! Super useful for us using S3 like Remote Build Cache.

We have done a little change in order to use the AWS credentials as we are using AWS STS credentials which require the session token.

AWS uses the session token to validate the temporary security credentials. https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_use-resources.html

The PR just add a new check to previous BasicAWSCredentials using instead of BasicSessionCredentials

[myniva]

Hi @durbon , I'm glad you like the plugin and very happy to have you as another contributor.

As far as I can tell for now, your changes make sense to me. I would kindly ask you to revert the formatting of the classes to the style they were before. Makes it a lot easier for me to do the review :-)

[myniva]

Please revert the format changes.

[durbon]

@myniva Thanks for considering to add the PR into the project
Sorry, for the automatic format changes, I have different project setting. I have reverted the format change, I now think is much clearer

Any doubts, please let me know

Regards

[myniva]

Thanks for updating the files. One last request: Please bump the version in version.properties to 0.9.0. After that, I'll merge this ASAP and v0.9.0 will be released automatically.

[durbon]

@myniva Done! Thanks!