numba: inverse functions, layout attributes, and better constructors

[eric-wieser]

This adds numba extension support for:

• A handful of MultiVector methods and attributes via straightforward wrappers.
  Within these, we only do if isinstance(self, MultiVectorType): in the functions where we rely on the existence of self.layout_type.
• Some Layout attributes via straightforward wrappers.
• The dtype argument to MultiVector

[codecov]

Codecov Report

Merging #412 (61e373e) into master (a7a5407) will increase coverage by 0.22%.
The diff coverage is 90.22%.

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   71.13%   71.35%   +0.22%     
==========================================
  Files          73       73              
  Lines        9326     9454     +128     
  Branches     1205     1211       +6     
==========================================
+ Hits         6634     6746     +112     
- Misses       2526     2538      +12     
- Partials      166      170       +4     

Impacted Files	Coverage Δ
clifford/numba/__init__.py	100.00% <ø> (ø)
clifford/numba/_multivector.py	73.53% <80.00%> (+0.51%)	⬆️
clifford/numba/_layout.py	94.20% <80.95%> (-3.84%)	⬇️
clifford/_layout.py	96.95% <100.00%> (+0.93%)	⬆️
clifford/test/test_numba_extensions.py	100.00% <100.00%> (ø)
clifford/tools/g3c/object_clustering.py	64.28% <0.00%> (-2.05%)	⬇️
clifford/test/test_g3c_tools.py	81.84% <0.00%> (-0.42%)	⬇️

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[hugohadfield]

This looks useful and sensible, and all the tests pass