Add endpoint to get threepids from server

synapse/storage/registration.py

@@ -186,3 +186,14 @@ class RegistrationStore(SQLBaseStore):
             "validated_at": validated_at,
             "added_at": added_at,
         })
+
+    @defer.inlineCallbacks
+    def user_get_threepids(self, user_id):
+        ret = yield self._simple_select_list(
+            "user_threepids", {
+                "user": user_id
+            },
+            ['medium', 'address', 'validated_at', 'added_at'],
+            'user_get_threepids'
+        )
+        defer.returnValue(ret)