3d removal of background

https://www.notion.so/qim-dtu/3D-remove-background-function-fac8e64da886429eacd9520bc7be0610?pvs=4

implemented into existing filters framework

qim3d/processing/operations.py

+import qim3d
+import qim3d.processing.filters as filters
+
+
+def remove_background(vol, **kwargs):
+    """
+    Remove background from a volume using a median filter followed by a tophat filter.
+
+    Args:
+        vol: The volume to remove background from.
+        **kwargs: Additional keyword arguments for the tophat filter.
+
+    Returns:
+        vol: The volume with background removed.
+    """
+    
+    # Create a pipeline with a median filter and a tophat filter
+    pipeline = filter.Pipeline(
+        filters.Median(),
+        filters.Tophat(**kwargs)
+    )
+
+    # Apply the pipeline to the volume
+    return pipeline(vol)
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