Improve tracking of existing entities in deconz (#40265)

* Store all entities in dict

* Use stored unique id to select if to create entity or not

* Remove unnecessary init

* Change so same physical sensor doesnt try to create multiple battery sensors
Change so groups get created properly

* Add controls in tests that entities are logged correctly

tests/components/deconz/test_cover.py

@@ -67,6 +67,7 @@ async def test_no_covers(hass):
     """Test that no cover entities are created."""
     gateway = await setup_deconz_integration(hass)
     assert len(gateway.deconz_ids) == 0
+    assert len(gateway.entities[cover.DOMAIN]) == 0
     assert len(hass.states.async_all()) == 0
 
 
@@ -81,6 +82,7 @@ async def test_cover(hass):
     assert "cover.deconz_old_brightness_cover" in gateway.deconz_ids
     assert "cover.window_covering_controller" in gateway.deconz_ids
     assert len(hass.states.async_all()) == 5
+    assert len(gateway.entities[cover.DOMAIN]) == 4
 
     level_controllable_cover = hass.states.get("cover.level_controllable_cover")
     assert level_controllable_cover.state == "open"
@@ -158,3 +160,4 @@ async def test_cover(hass):
     await gateway.async_reset()
 
     assert len(hass.states.async_all()) == 0
+    assert len(gateway.entities[cover.DOMAIN]) == 0