Sankey diagram example

[Andy-Grigg]

Closes #736

Add an example of a Sankey diagram. This is still somewhat limited, there is no in-use, circularity, or end-of-life aspect to the analytics, but nevertheless this shows the principle of how the total embodied energy of a product is created based on the materials, processes, and transportation.

This could also be done as part of the full hierarchical BoM. I might have a look to see how the visualization works there, but I feel like the data would be too complex to make sense of.

I also thought about adding this as a standalone example. I don't think it warrants this on its own, but possibly the graphing could all be broken out into individual examples. This probably wouldn't be too bad to do.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.88%. Comparing base (01e5cbb) to head (8d00059).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #803      +/-   ##
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+ Coverage   97.53%   97.88%   +0.35%     
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  Files          28       28              
  Lines        3124     3124              
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+ Hits         3047     3058      +11     
+ Misses         77       66      -11     

Flag	Coverage Δ
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integration-ubuntu-latest-TEST_SERVER_25R1_URL	81.37% <ø> (?)
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integration-windows-latest-TEST_SERVER_25R2_URL	87.54% <ø> (?)
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[da1910]

Looks fine in terms of the code and it renders the code cells correctly - nothing is showing up for the plots for me locally, just a warning that ploty objects cannot be displayed. I suspect this is not a problem with this PR

[Andy-Grigg]

I have spiked splitting the Sustainability Summary example into separate notebooks for the summary, materials and processes, transports, and full hierarchy on a separate branch. I'll try and finish that off today, but it will be a separate branch and PR.