Add member list to group detail view

[Encotric]

As a group member, I would like to see a member list including the member’s name and email on a group’s detail view to ensure I am interacting with the right group and can approximate the size of the group.

It is sufficient to reuse the table which was developed for the group management page but without the action buttons.

FYI: this story only focuses on the third part of the group detail page - the member list. There are other stories for the item overview and group description and picture as well.

Dependencies

• Add group detail view #315

Acceptance Criteria

• All group members are listed in the table with their names and email addresses
• Members can be contacted with a "mailto" link when I click on the chat icon next to their member entries (similar to group management page)

[TobiPeterG]

tracked in #376