Connect weather complication view with DreamSmartspaceController

- Added a weatherPlugin in DreamSmartspaceController to connect
  weather data provider and weather smartspace view.
- Added an optional parameter viewWithCustomLayout to create
  a SmartspaceView with custom layout other than the default
  view (weather.xml) returned from plugin.getView.

Bug: b/270170447
Test: atest DreamSmartspaceControllerTest
Test:  manually with ag/21737817
Change-Id: I2140e871416d1a4653f0e147106b0697ff6f30a1