[Feature request] Add AWS IAM authorization support from the original repo

[longmtran]

Hi,

Could we port the AWS IAM auth support from the original repo please? Here's the PR in the old repo:

mghoneimy/php-graphql-client#64

Thanks

[longmtran]

Upon further checking the history, this feature was actually ported back then. but the aws iam implementation, AwsIamAuth.php and other related files were somehow removed in the latest version 1.14.1. It is still there in 1.14.0.

It was removed in this commit:
50a1a66#diff-5c5098ee5412bfa419c9466ba41ac5076321dd02cc578b4c0325598d4a6fcee0

Is there a reason why this was removed? The commit message did not mention anything about it. Is it possible to bring this back please?

If not, I guess I could implement the auth interface locally in my project.