Add additional Group Calling features.

app/src/main/proto/Database.proto

@@ -69,3 +69,10 @@ message BodyRangeList {
 
     repeated BodyRange ranges = 1;
 }
+
+message GroupCallUpdateDetails {
+             string eraId                = 1;
+             string startedCallUuid      = 2;
+             int64  startedCallTimestamp = 3;
+    repeated string inCallUuids          = 4;
+}