Grassmannian manifold visualization for 3D

[Jacqueskim]

• Add a test case for grassmannian manifold
• Follow the docstring guidelines
• Pass the linting test for Grassmannian.py and test file

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Codecov Report

Merging #1804 (e414579) into master (6f37453) will decrease coverage by 0.62%.
The diff coverage is 52.00%.

@@            Coverage Diff             @@
##           master    #1804      +/-   ##
==========================================
- Coverage   91.50%   90.87%   -0.62%     
==========================================
  Files         136      137       +1     
  Lines       13738    13963     +225     
==========================================
+ Hits        12569    12688     +119     
- Misses       1169     1275     +106     

Flag	Coverage Δ
autograd	86.82% <52.00%> (-0.60%)	⬇️
numpy	86.48% <52.00%> (-0.62%)	⬇️
pytorch	80.02% <52.00%> (-0.48%)	⬇️

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Impacted Files	Coverage Δ
geomstats/visualization/grassmannian.py	52.00% <52.00%> (ø)
geomstats/information_geometry/dirichlet.py	93.69% <0.00%> (+0.36%)	⬆️
geomstats/learning/expectation_maximization.py	81.01% <0.00%> (+0.56%)	⬆️

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[ninamiolane]

Address my comments from Christine's PR (applied to this PR) and resubmit.