Hypercube/n-cube skeleton

[ijbarnes]

Closes #2511

Wrote some skeleton code and focused on proper documentation. If I am not adhering to processes or standards, please let me know, this is my first time doing an open source contribution. Thank you.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 84.38%. Comparing base (4ddb838) to head (fe741f9).
Report is 1 commits behind head on master.

❗ Current head fe741f9 differs from pull request most recent head 4e34732. Consider uploading reports for the commit 4e34732 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2584      +/-   ##
==========================================
- Coverage   84.40%   84.38%   -0.02%     
==========================================
  Files         376      376              
  Lines       61688    61691       +3     
  Branches    12070    12079       +9     
==========================================
- Hits        52065    52058       -7     
- Misses       9623     9633      +10     

Files	Coverage Δ
src/constructors/regular.c	87.12% <0.00%> (-2.37%)	⬇️

... and 11 files with indirect coverage changes

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[szhorvat]

Let us know if you need some help before you can proceed with this PR.

[szhorvat]

I'd like to have this functionality, so I'll implement it myself. You can still work on the other issues you expressed interest in :-)