[Task Runner API] [Flower Interoperability] Integrate changes for flower-app-pytorch workspace's custom Aggregator into core component (#1585)

* integrate custom flwr workspace aggregator to core aggregator

Signed-off-by: kta-intel <kevin.ta@intel.com>

* formatting

Signed-off-by: kta-intel <kevin.ta@intel.com>

* change self.use_connector > self.interop_mode

Signed-off-by: kta-intel <kevin.ta@intel.com>

* docstring for connector

Signed-off-by: kta-intel <kevin.ta@intel.com>

* formatting

Signed-off-by: kta-intel <kevin.ta@intel.com>

---------

Signed-off-by: kta-intel <kevin.ta@intel.com>
Co-authored-by: teoparvanov <teodor.parvanov@intel.com>

Author: kminhta

openfl-workspace/flower-app-pytorch/plan/plan.yaml

@@ -3,7 +3,7 @@
 
 aggregator :
   defaults : plan/defaults/aggregator.yaml
-  template : src.aggregator.AggregatorFlower
+  template : openfl.component.Aggregator
   settings :
     rounds_to_train : 1 # DO NOT EDIT. This is to indicate OpenFL communication rounds
     persist_checkpoint : false