Add object filter ratio (#2952)

* Add object ratio config parameters

Issue: #2948

* Add config test for object filter ratios

Issue: #2948

* Address review comments

- Accept `ratio` default
- Rename `bounds` to `box` for consistency
- Add migration for new field

Issue: #2948

* Fix logical errors

- field migrations require default values
- `clipped` referenced the wrong index for region, since it shifted
- missed an inclusion of `ratio` for detections in `process_frames`
- revert naming `o[2]` as `box` since it is out of scope!

This has now been test-run against a video, so I believe the kinks are
worked out.

Issue: #2948

* Update contributing notes for `make`

Issue: #2948

* Fix migration

- Ensure that defaults match between Event and migration script
- Deconflict migration script number (from rebase)

Issue: #2948

* Filter objects out of ratio bounds

Issue: #2948

* Update migration file to 009

Issue: #2948

docs/docs/integrations/mqtt.md

@@ -52,6 +52,7 @@ Message published for each changed event. The first message is published when th
     "score": 0.7890625,
     "box": [424, 500, 536, 712],
     "area": 23744,
+    "ratio": 2.113207,
     "region": [264, 450, 667, 853],
     "current_zones": ["driveway"],
     "entered_zones": ["yard", "driveway"],
@@ -75,6 +76,7 @@ Message published for each changed event. The first message is published when th
     "score": 0.87890625,
     "box": [432, 496, 544, 854],
     "area": 40096,
+    "ratio": 1.251397,
     "region": [218, 440, 693, 915],
     "current_zones": ["yard", "driveway"],
     "entered_zones": ["yard", "driveway"],