Show member list for private groups

Merged Mikolai Gütschow requested to merge 495-group-member-list into main

Currently difficult to test since Briar core's TestDataCreator apparently doesn't create private groups and our deterministic test data creator for now only creates empty private groups until #113 (closed) is solved. Can now be tested either with random test data or by starting TestWith{Two,Three}ConnectedTemporaryAccounts.

Draft since based on !313 (merged) !328 (merged)

Closes #495 (closed)

Edited by Mikolai Gütschow

Merge request reports