Move recording management to separate process (#6248)

* Move recordings management to own process and ensure db multiprocess access

* remove reference to old threads

* Cleanup directory remover

* Mypy fixes

* Fix mypy

* Add support back for setting record via MQTT and WS

* Formatting

* Fix rebase issue

frigate/record/util.py

@@ -0,0 +1,19 @@
+"""Recordings Utilities."""
+
+import os
+
+
+def remove_empty_directories(directory: str) -> None:
+    # list all directories recursively and sort them by path,
+    # longest first
+    paths = sorted(
+        [x[0] for x in os.walk(directory)],
+        key=lambda p: len(str(p)),
+        reverse=True,
+    )
+    for path in paths:
+        # don't delete the parent
+        if path == directory:
+            continue
+        if len(os.listdir(path)) == 0:
+            os.rmdir(path)