Materials Support for STEP Import/Export

[jmwright]

No description provided.

[shimwell]

This PR closes #1954

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.84%. Comparing base (2e05819) to head (0e5055c).

Files with missing lines	Patch %	Lines
cadquery/occ_impl/importers/assembly.py	95.23%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1956   +/-   ##
=======================================
  Coverage   95.84%   95.84%           
=======================================
  Files          29       29           
  Lines        7922     7951   +29     
  Branches     1191     1194    +3     
=======================================
+ Hits         7593     7621   +28     
  Misses        192      192           
- Partials      137      138    +1     

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[jmwright]

@adam-urbanczyk When you get a chance, could you take a look at the mypy error on this? I've had similar problems before where every change I make to the AssemblyProtocol overloads seems to break other things. I'm trying not to be too disruptive with this change since I know you put a lot of effort into making this code run correctly, so I do not want to be hacking around a lot trying to figure out how to fix mypy.

mypy error for reference:

cadquery/occ_impl/importers/assembly.py:259: error: No overload variant of "add" of "AssemblyProtocol" matches argument types "AssemblyProtocol", "Location", "str", "Color | None", "Material | None"  [call-overload]
cadquery/occ_impl/importers/assembly.py:259: note: Possible overload variants:
cadquery/occ_impl/importers/assembly.py:259: note:     def add(self, obj: AssemblyProtocol, loc: Location | None = ..., name: str | None = ..., color: Color | None = ...) -> AssemblyProtocol
cadquery/occ_impl/importers/assembly.py:259: note:     def add(self, obj: Shape | Workplane | None, loc: Location | None = ..., name: str | None = ..., color: Color | None = ..., material: Material | str | None = ..., metadata: dict[str, Any] | None = ...) -> AssemblyProtocol

[adam-urbanczyk]

I think I fixed it, the overloads were not annotated properly.

[jmwright]

@adam-urbanczyk Thanks!

[adam-urbanczyk]

LGTM, thanks!

[lorenzncode]

I added a comment, also there is a typo line 1067 test_assembly.py (earlier commit):
# Test the ability to has a material
"to have"

[jmwright]

I'll wait for a day or two before merging in case I missed anything else.