Expose more statistics

* differenciate local & all events/comments/groups
* add instance follows/followings

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/types/statistics.model.ts

@@ -1,6 +1,11 @@
 export interface IStatistics {
   numberOfUsers: number;
   numberOfEvents: number;
+  numberOfLocalEvents: number;
   numberOfComments: number;
+  numberOfLocalComments: number;
   numberOfGroups: number;
+  numberOfLocalGroups: number;
+  numberOfInstanceFollowings: number;
+  numberOfInstanceFollowers: number;
 }