Xz/luxor tensor plot

[ArrogantGao]

Add the viz tool LuxorTensorPlot as an extension of the OMEinsumContractionOrders.
Two function have been provided, viz_eins plots the tensor network, and viz_contraction generate videos of an contraction order.
For more detailed usage, see the revised README.md.

[codecov]

Codecov Report

Attention: Patch coverage is 80.24691% with 32 lines in your changes missing coverage. Please review.

Project coverage is 92.83%. Comparing base (cc2295f) to head (3c3f608).
Report is 1 commits behind head on master.

Files	Patch %	Lines
ext/LuxorTensorPlot/src/viz_contraction.jl	80.30%	13 Missing ⚠️
src/visualization.jl	0.00%	8 Missing ⚠️
ext/LuxorTensorPlot/src/hypergraph.jl	81.57%	7 Missing ⚠️
ext/LuxorTensorPlot/src/viz_eins.jl	91.83%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   93.16%   92.83%   -0.33%     
==========================================
  Files          13       18       +5     
  Lines        1097     1270     +173     
==========================================
+ Hits         1022     1179     +157     
- Misses         75       91      +16     

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[GiggleLiu]

Please add some tests.

[ArrogantGao]

Added some dependency for the functions defined in src/visualization.jl and making sure they throw ArgumentError if the extension LuxorTensorPlot is not loaded.

[ArrogantGao]

It is strange the the CodeCov seems not working correctly, the revised results are not uploaded properly.

{'detail': ErrorDetail(string='Rate limit reached. Please upload with the Codecov repository upload token to resolve issue. Expected time to availability: 2376s.', code='throttled')}

[GiggleLiu]

I made a few updates, please confirm the changes are reasonable.

[ArrogantGao]

Thanks a lot for your help, I think all changes are reasonable and greatly simplified the code.

[GiggleLiu]

Nice, I just made a minor release here: JuliaRegistries/General#112375