Add literate.jl tutorial infrastructure

[kdayday]

Adds the tutorial processing infrastructure documented in Sienna-Platform/PowerAnalytics.jl#51, although PG does not currently have any tutorials

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.57%. Comparing base (e9ed582) to head (f24b2fc).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
+ Coverage   86.54%   87.57%   +1.02%     
==========================================
  Files           6        6              
  Lines         342      338       -4     
==========================================
  Hits          296      296              
+ Misses         46       42       -4     

Flag	Coverage Δ
unittests	87.57% <ø> (+1.02%)	⬆️

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see 2 files with indirect coverage changes

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