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/groups/image_depth_cutout.py

@@ -1,7 +1,11 @@
 """Build O Image Depth Cutout."""
 import bpy
 from anyimage.operators.cutout_tool.shape import NORMAL_REDUCTION_ATTRIBUTE_NAME
-from ..common.nodes import interface_socket, group_input, float_input, read_float_attribute, store_float_attribute, prepare_node_group, sample_field, evaluate_field
+from ..common.nodes import (
+    interface_socket, group_input, float_input, read_float_attribute,
+    store_float_attribute, prepare_node_group, sample_field, evaluate_field,
+    compare_node,
+)
 from ..common.boundary_smoothing import smooth_cut_boundary
 from ..common.cutout import _position_field, _shade_output
 from ..common.depth_surface import _math, project_depth_surface, build_surface_camera, split_depth_surface, sample_face_camera, thicken_depth_surface
@@ -314,7 +318,7 @@ def _build_depth_surface(group, geometry, controls):
     links.new(is_shell, selected_thickness.inputs["Switch"])
     links.new(controls.outputs["Thickness"], selected_thickness.inputs["False"])
     links.new(controls.outputs["Shell Thickness"], selected_thickness.inputs["True"])
-    has_thickness = _math(group, "GREATER_THAN", selected_thickness.outputs[0], 1e-6)
+    has_thickness = compare_node(group, "GREATER_THAN", selected_thickness.outputs[0], 1e-6)
     zero_shell = group.nodes.new("GeometryNodeSwitch")
     zero_shell.input_type = "GEOMETRY"
     links.new(has_thickness, zero_shell.inputs["Switch"])