add filter to init file

Author: czaloom

src/valor_lite/semantic_segmentation/__init__.py

@@ -1,5 +1,5 @@
 from .annotation import Bitmask, Segmentation
-from .manager import DataLoader, Evaluator
+from .manager import DataLoader, Evaluator, Filter
 from .metric import Metric, MetricType
 
 __all__ = [
@@ -9,4 +9,5 @@
     "Bitmask",
     "Metric",
     "MetricType",
+    "Filter",
 ]