Handle pagination for the federated actions & followers responses (#1731)

* Add pagination for admin social list

* Use Paginated API for followers tab on frontend

controllers/pagination.go

@@ -0,0 +1,7 @@
+package controllers
+
+// PaginatedResponse is a structure for returning a total count with results.
+type PaginatedResponse struct {
+	Total   int         `json:"total"`
+	Results interface{} `json:"results"`
+}