[filter] (size) Add SizeObjectsFilter

src/polystar/target_pipeline/objects_filters/size_filter.py

+from dataclasses import dataclass
+
+from polystar.models.roco_object import ROCOObject
+from polystar.target_pipeline.objects_filters.objects_filter_abc import ObjectsFilterABC
+
+
+@dataclass
+class SmallObjectFilter(ObjectsFilterABC):
+    min_size: int
+
+    def validate_single(self, obj: ROCOObject) -> bool:
+        return obj.box.area >= self.min_size