Add OAuth2 config flow scaffold (#28220)

* Add OAuth2 scaffold

* Generate integration if non-existing domain specified

* Update URL

script/scaffold/templates/config_flow/integration/__init__.py

@@ -0,0 +1,49 @@
+"""The NEW_NAME integration."""
+import asyncio
+
+import voluptuous as vol
+
+from homeassistant.core import HomeAssistant
+from homeassistant.config_entries import ConfigEntry
+
+from .const import DOMAIN
+
+CONFIG_SCHEMA = vol.Schema({DOMAIN: vol.Schema({})}, extra=vol.ALLOW_EXTRA)
+
+# TODO List the platforms that you want to support.
+# For your initial PR, limit it to 1 platform.
+PLATFORMS = ["light"]
+
+
+async def async_setup(hass: HomeAssistant, config: dict):
+    """Set up the NEW_NAME component."""
+    return True
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
+    """Set up Somfy from a config entry."""
+    # TODO Store an API object for your platforms to access
+    # hass.data[DOMAIN][entry.entry_id] = MyApi(…)
+
+    for component in PLATFORMS:
+        hass.async_create_task(
+            hass.config_entries.async_forward_entry_setup(entry, component)
+        )
+
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry):
+    """Unload a config entry."""
+    unload_ok = all(
+        await asyncio.gather(
+            *[
+                hass.config_entries.async_forward_entry_unload(entry, component)
+                for component in PLATFORMS
+            ]
+        )
+    )
+    if unload_ok:
+        hass.data[DOMAIN].pop(entry.entry_id)
+
+    return unload_ok