sourceIdentity annotation

[mhebrard-bigid]

What would you like to be added:
Capability to set sourceIdentity annotation.

Why is this needed:
From: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_control-access_monitor.html

After a source identity is set, it is present in requests for any AWS action taken during the role session. The value that is set persists when a role is used to assume another role through the AWS CLI or AWS API, known as role chaining.