Add support for native oauth2 in Point (#118243)

* initial oauth2 implementation

* fix unload_entry

* read old yaml/entry config

* update tests

* fix: pylint on tests

* Apply suggestions from code review

Co-authored-by: Robert Resch <robert@resch.dev>

* fix constants, formatting

* use runtime_data

* Apply suggestions from code review

Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

* fix missing import

* adopt to PointData dataclass

* fix typing

* add more strings (copied from weheat)

* move the PointData dataclass to avoid circular imports

* use configflow inspired by withings

* raise ConfigEntryAuthFailed

* it is called entry_lock

* fix webhook issue

* fix oauth_create_entry

* stop using async_forward_entry_setup

* Fixup

* fix strings

* fix issue that old config might be without unique_id

* parametrize tests

* Update homeassistant/components/point/config_flow.py

* Update tests/components/point/test_config_flow.py

* Fix

---------

Co-authored-by: Robert Resch <robert@resch.dev>
Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>

homeassistant/components/point/api.py

@@ -0,0 +1,26 @@
+"""API for Minut Point bound to Home Assistant OAuth."""
+
+from aiohttp import ClientSession
+import pypoint
+
+from homeassistant.helpers import config_entry_oauth2_flow
+
+
+class AsyncConfigEntryAuth(pypoint.AbstractAuth):
+    """Provide Minut Point authentication tied to an OAuth2 based config entry."""
+
+    def __init__(
+        self,
+        websession: ClientSession,
+        oauth_session: config_entry_oauth2_flow.OAuth2Session,
+    ) -> None:
+        """Initialize Minut Point auth."""
+        super().__init__(websession)
+        self._oauth_session = oauth_session
+
+    async def async_get_access_token(self) -> str:
+        """Return a valid access token."""
+        if not self._oauth_session.valid_token:
+            await self._oauth_session.async_ensure_token_valid()
+
+        return self._oauth_session.token["access_token"]