Add an option to create mappings between AD group and local Groups (group module))

Problem/Motivation

This proposes to add an option for mappings between the AD groups and the Drupal Groups ( from the Group module https://www.drupal.org/project/group )

Initially, I was thinking to contribute this as an additional module, but thought to maybe give it a chance to add it as a patch.
There is an increasing demand for community websites which is evident from the Group module popularity https://www.drupal.org/project/usage/group.
Larger enterprises using Azure AD usually wish to split their user base into different departments so they are also benefitting from this.

Proposed resolution

The module currently implements functionality for mapping between the AD groups and Drupal roles. I am proposing to use a similar approach to map users to Drupal groups and re-use existing code where possible.

User interface changes

There will be some additional elements in the OpenID configuration page that allow for group mapping info.