Add CallableEventWithFilter support to GarbageCollector (#6663)

Fixes # .

### Description

Adds support for CallableEventWithFilter which is useful for not calling
the GarbageCollector every iteration but e.g. every 10 iterations.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [x] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [x] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Matthias Hadlich <matthiashadlich@posteo.de>

Author: matt3o

monai/handlers/garbage_collector.py

@@ -19,7 +19,11 @@
 
 if TYPE_CHECKING:
     from ignite.engine import Engine, Events
+    from ignite.engine.events import CallableEventWithFilter
 else:
+    CallableEventWithFilter, _ = optional_import(
+        "ignite.engine.events", IgniteInfo.OPT_IMPORT_VERSION, min_version, "CallableEventWithFilter"
+    )
     Engine, _ = optional_import("ignite.engine", IgniteInfo.OPT_IMPORT_VERSION, min_version, "Engine")
     Events, _ = optional_import("ignite.engine", IgniteInfo.OPT_IMPORT_VERSION, min_version, "Events")
 
@@ -43,9 +47,9 @@ class GarbageCollector:
             - 0 (NOTSET)
     """
 
-    def __init__(self, trigger_event: str = "epoch", log_level: int = 10):
-        self.trigger_event: Events
-        if isinstance(trigger_event, Events):
+    def __init__(self, trigger_event: str | Events | CallableEventWithFilter = "epoch", log_level: int = 10):
+        self.trigger_event: Events | CallableEventWithFilter
+        if isinstance(trigger_event, Events) or isinstance(trigger_event, CallableEventWithFilter):
             self.trigger_event = trigger_event
         elif trigger_event.lower() == "epoch":
             self.trigger_event = Events.EPOCH_COMPLETED