Make Admin Groups page columns sortable and add column "Followers"

[mariobehling]

1. Currently the column "Owner" and "Number of Events" are not sortable on the groups admin page at https://eventyay.com/admin/groups/live. Please implement the sorting functionality.

2. Also implement a column "Followers" and show the number of followers of this group in the column.

[sachinchauhan2889]

looking