MutualGroupDMs: Add expandable list to DM sidebar

[DokterKaj]

Plugin Description

This is a feature request for the already-existing plugin MutualGroupDMs.
In the DM sidebar, below the profile card, there are two expandable lists for mutual servers and mutual friends. Please add one for mutual groups too.

Image for reference:

Existing Plugin for other mod

No response

Request Agreement

• I read the above and made sure my plugin is possible and allowed
• I checked the existing plugins and made sure my plugin doesn't already exist
• I searched the existing issues and made sure a similar request doesn't already exist

[Covkie]

Could probably also throw the user popout and server info into the feature request

[JDJGInc]

Could probably also throw the user popout and server info into the feature request

Kind of a duplicate to my thread:
#368

[JDJGInc]

Although this would be a cool addition to the plugin idea I have.