Refactor comparison operations in geometry nodes

- Introduced a new `compare_node` function to streamline comparison operations across various geometry nodes.
- Replaced instances of mathematical comparison nodes with the new `compare_node` function in multiple files, enhancing code readability and maintainability.
- Updated related logic in cutout, depth surface, and image processing groups to utilize the new comparison method.
- Ensured consistent handling of boolean logic through the introduction of a `boolean_node` function for combining boolean inputs.

tools/nodes/common/cutout.py

@@ -1,5 +1,5 @@
 """Build geometry calculations shared by Cutout assets."""
-from .nodes import math_node
+from .nodes import compare_node, math_node
 from anyimage.operators.cutout_tool.shape import BALLOON_ATTRIBUTE_NAME
 
 
@@ -107,12 +107,10 @@ def _remove_zero_thickness(
 ):
     nodes = group.nodes
     links = group.links
-    zero = math_node(nodes, "LESS_THAN")
-    zero.inputs[1].default_value = 1e-6
-    links.new(thickness, zero.inputs[0])
+    zero = compare_node(group, "LESS_THAN", thickness, 1e-6)
     choose = nodes.new("GeometryNodeSwitch")
     choose.input_type = "GEOMETRY"
-    links.new(zero.outputs[0], choose.inputs["Switch"])
+    links.new(zero, choose.inputs["Switch"])
     links.new(shaped_geometry, choose.inputs["False"])
     links.new(zero_geometry, choose.inputs["True"])
     return choose.outputs["Output"]