devel/rubygem-google-apis-iam_v1050: Add rubygem-google-apis-iam_v1050 0.50.0

This is a simple client library for version V1 of the Identity and Access
Management (IAM) API. It provides:

• A client object that connects to the HTTP/JSON REST endpoint for the service.
• Ruby objects for data structures related to the service.
• Integration with the googleauth gem for authentication using OAuth, API keys, and service accounts.
• Control of retry, pagination, and timeouts.