Add support for importing integrations in the executor (#111336)

* Add support for pre-imports at setup time

alternative solution to #111331

* refactor

* refactor

* refactor

* mark >1.0s integrations

* no point in executor if already loaded

* no point in executor if already loaded

* cleanup

* cleanup

* two more

* one more

* analytics loads a lot more integrations

* cloud

* debug

* psutil, hardwre

* try zha

* Update homeassistant/setup.py

* await

* comments

* coverage

* coverage

* coverage

* move logic to loader

* move logic to loader

* preserve comments

homeassistant/config_entries.py

@@ -476,7 +476,7 @@ class ConfigEntry:
 
         if domain_is_integration:
             try:
-                integration.get_platform("config_flow")
+                await integration.async_get_platform("config_flow")
             except ImportError as err:
                 _LOGGER.error(
                     (
@@ -2427,9 +2427,8 @@ async def _load_integration(
 
     # Make sure requirements and dependencies of component are resolved
     await async_process_deps_reqs(hass, hass_config, integration)
-
     try:
-        integration.get_platform("config_flow")
+        await integration.async_get_platform("config_flow")
     except ImportError as err:
         _LOGGER.error(
             "Error occurred loading flow for integration %s: %s",