Better imprint for assy

[adam-urbanczyk]

Low level fix enabling faster imprints for well behaved models.

NB: this PR also contains a typing fix related to Numba version update.

---

Tangentially related to this PR (I added explicit test for this use case) - it is possible to imprint subassemblies separately and on per subassy basis use different imprint glue settings in order to optimize performance:

res1, origins1 = cq.occ_impl.assembly.imprint(complex_assy.sub1, glue='partial')
res2, origins2 = cq.occ_impl.assembly.imprint(complex_assy.sub2, glue='full')

# combine the results
res: Compound = res1 | res2
origins: dict[Shape, Shape] = origins1 | origins2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.70%. Comparing base (b47f7b7) to head (48a005a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2069   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files          30       30           
  Lines        9479     9479           
  Branches     1410     1410           
=======================================
  Hits         9072     9072           
  Misses        253      253           
  Partials      154      154           

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[lorenzncode]

Thanks @adam-urbanczyk !

[adam-urbanczyk]

@jmwright would you be able to take a look?

[jmwright]

This MRE:

import cadquery as cq
from cadquery.occ_impl.assembly import imprint
imprint(cq.Assembly().add(cq.Workplane().box(1, 1, 1)))

gives this error:

Traceback (most recent call last):
  File "<python-input-4>", line 1, in <module>
    imprint(cq.Assembly().add(cq.Workplane().box(1, 1, 1)))
    ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/jwright/repos/cadquery/cadquery/occ_impl/assembly.py", line 885, in imprint
    res = Shape(builder.Shape())
  File "/home/jwright/repos/cadquery/cadquery/occ_impl/shapes.py", line 445, in __init__
    self.wrapped = downcast(obj)
                   ~~~~~~~~^^^^^
  File "/home/jwright/repos/cadquery/cadquery/occ_impl/shapes.py", line 419, in downcast
    f_downcast: Any = downcast_LUT[shapetype(obj)]
                                   ~~~~~~~~~^^^^^
  File "/home/jwright/repos/cadquery/cadquery/occ_impl/shapes.py", line 409, in shapetype
    raise ValueError("Null TopoDS_Shape object")

[jmwright]

Suggested change

	Depending on the use case, it might be required do use different `glue` option. Moreover, for large models
	Depending on the use case, it might be required to use a different `glue` option. Moreover, for large models

[jmwright]

Suggested change

	Depending on the use case, it might be required do use different `glue` option. Moreover, for large models
	Depending on the use case, it might be required to use a different `glue` option. Moreover, for large models