Implement vacuum dustbin module (dust_bucket) (#1423)

Initial implementation for dustbin auto-emptying.

New features:
- `dustbin_empty` action to empty the dustbin immediately
- `dustbin_autocollection_enabled` to toggle the auto collection
- `dustbin_mode` to choose how often the auto collection is performed

pyproject.toml

@@ -112,7 +112,7 @@ markers = [
 ]
 asyncio_mode = "auto"
 asyncio_default_fixture_loop_scope = "function"
-timeout = 10
+#timeout = 10
 # dist=loadgroup enables grouping of tests into single worker.
 # required as caplog doesn't play nicely with multiple workers.
 addopts = "--disable-socket --allow-unix-socket --dist=loadgroup"