Support longer-than-60-second scan_interval and interval_seconds (#5147)

* Update scan_interval and interval_seconds max to 1 day vs. 60 seconds

* Format fixes

* Add docstring on unittest.

* Added and implemented new async_track_time_interval helper.

* Format fixes, removed unused import.

* Undid whoops on unsub_polling.

* Updated unit tests for scan_interval.

* Added unit test for track_time_interval.

* Allow other forms of time interval input for scan_interval and interval_seconds

tests/helpers/test_event.py

@@ -15,6 +15,7 @@ from homeassistant.helpers.event import (
     track_utc_time_change,
     track_time_change,
     track_state_change,
+    track_time_interval,
     track_sunrise,
     track_sunset,
 )
@@ -187,6 +188,34 @@ class TestEventHelpers(unittest.TestCase):
         self.assertEqual(5, len(wildcard_runs))
         self.assertEqual(6, len(wildercard_runs))
 
+    def test_track_time_interval(self):
+        """Test tracking time interval."""
+        specific_runs = []
+
+        utc_now = dt_util.utcnow()
+        unsub = track_time_interval(
+            self.hass, lambda x: specific_runs.append(1),
+            timedelta(seconds=10)
+        )
+
+        self._send_time_changed(utc_now + timedelta(seconds=5))
+        self.hass.block_till_done()
+        self.assertEqual(0, len(specific_runs))
+
+        self._send_time_changed(utc_now + timedelta(seconds=13))
+        self.hass.block_till_done()
+        self.assertEqual(1, len(specific_runs))
+
+        self._send_time_changed(utc_now + timedelta(minutes=20))
+        self.hass.block_till_done()
+        self.assertEqual(2, len(specific_runs))
+
+        unsub()
+
+        self._send_time_changed(utc_now + timedelta(seconds=30))
+        self.hass.block_till_done()
+        self.assertEqual(2, len(specific_runs))
+
     def test_track_sunrise(self):
         """Test track the sunrise."""
         latitude = 32.87336