Add a helper for mapping between different algebras which share basis lades

[eric-wieser]

TODO:

• Tests
• Check docs

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[lgtm-com]

This pull request introduces 3 alerts when merging a1c710c into 26c333c - view on LGTM.com

new alerts:

• 2 for Unused import
• 1 for Wrong number of arguments in a call

[lgtm-com]

This pull request introduces 1 alert when merging 2ddd7b6 into 26c333c - view on LGTM.com

new alerts:

• 1 for Wrong number of arguments in a call

[codecov]

Codecov Report

Merging #300 into master will decrease coverage by 34.37%.
The diff coverage is 34.22%.

@@             Coverage Diff             @@
##           master     #300       +/-   ##
===========================================
- Coverage   62.71%   28.34%   -34.38%     
===========================================
  Files          57       57               
  Lines        7692     7833      +141     
  Branches     1064     1081       +17     
===========================================
- Hits         4824     2220     -2604     
- Misses       2725     5557     +2832     
+ Partials      143       56       -87

Impacted Files	Coverage Δ
clifford/__init__.py	52.32% <100%> (-20.35%)	⬇️
clifford/_blademap.py	25.68% <21.68%> (-29.16%)	⬇️
clifford/test/test_bit_helpers.py	38.29% <43.24%> (-61.71%)	⬇️
clifford/_bit_helpers.py	64.91% <57.14%> (-7.51%)	⬇️
clifford/g2c.py	0% <0%> (-100%)	⬇️
clifford/g3_1.py	0% <0%> (-100%)	⬇️
clifford/_parser.py	0% <0%> (-100%)	⬇️
clifford/g2.py	0% <0%> (-100%)	⬇️
clifford/g3.py	0% <0%> (-100%)	⬇️
clifford/g4.py	0% <0%> (-100%)	⬇️
... and 40 more

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