LDAP Authentication - Advanced Settings - Group Mappings: Free text field for comments and "group by" and "search option" and "Multiple org_id"

**Why is this needed**: In the advanced options you can define multiple user groups in the active directory and add these to and org_id. If you want the user to be part of multiple Ordanizations then you have to add the group mapping multiple times and user each time another org_id. Further if you have a long list of users and you want to know which users are allowed to access org_id 47 then you have to scroll through the complete list. AD groups sometimes have names which are not intuitive or are only there for specific projects. Sometimes you receive requests to add users to grafana via a change management system. Would be helpful to have a free text field to add some information why the group mapping existis, what they need editor role, what was the change ID and the date this was added. If you have multiple AD groups which are not nested and you want to add these to the same organization then you have to add multiple group mappings for the same purpose. **What would you like to be added**: - possibility to add multiple org_ids in a group mapping for the same group with the same rights. If user group A should have editor rights in org_id 1 and 2 then this should be possible to be added in one group mapping and not two. - a possibility to group/filter/search for specific criteria e.g. for org_id or Role. I want to select "org_id 1" and then I can see all group mappings for this org_id or show me all with Role "Editor". - A free text field in each group mapping which allows to add some information which explain what these groups are. - add a possibility to add multiple paths and user groups within one group mapping which share the same role and org_ids and not addmultiple mappings with the same purpose. - <img width="942" height="764" alt="Image" src="https://github.com/user-attachments/assets/54852e3b-15e8-4362-afde-892504fde38d" /> **Who is this feature for?** everyone who needs to maintain multiple different AD groups and multiple different OrgIDs and using Gra…