Api improvements (#15327)

* Organize api files

* Add more API definitions for events

* Add export select by ID

* Typing fixes

* Update openapi spec

* Change type

* Fix test

* Fix message

* Fix tests

frigate/api/defs/query/app_query_parameters.py

@@ -0,0 +1,12 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class AppTimelineHourlyQueryParameters(BaseModel):
+    cameras: Optional[str] = "all"
+    labels: Optional[str] = "all"
+    after: Optional[float] = None
+    before: Optional[float] = None
+    limit: Optional[int] = 200
+    timezone: Optional[str] = "utc"