WIP: Support for 3D structure functions

[cassidymwagner]

This feature will calculate structure functions for 3D velocity data, likely from LES data.

TODO:

• 3D advection
• 3D shift array
• 3D separation distances
  • Only for uniform idealized simulations, not worrying about latlon data for now.
• 3D structure functions
  • Traditional
  • Advective
• 3D parent function
• Tests
• Documentation/docstring
  • Docstring should be in a good spot

[cassidymwagner]

For calculate_structure_function_3d, need to think traditional structure functions with z dimension.

[codecov]

Codecov Report

Attention: Patch coverage is 85.46099% with 41 lines in your changes missing coverage. Please review.

Project coverage is 92.37%. Comparing base (8145a1f) to head (ae0ca0b).

Files	Patch %	Lines
fluidsf/generate_structure_functions_3d.py	76.78%	39 Missing ⚠️
fluidsf/generate_structure_functions_1d.py	60.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8145a1f) and HEAD (ae0ca0b). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (8145a1f)	HEAD (ae0ca0b)
	9	6

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   98.19%   92.37%   -5.82%     
==========================================
  Files          10       15       +5     
  Lines         332      590     +258     
==========================================
+ Hits          326      545     +219     
- Misses          6       45      +39     

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[cassidymwagner]

After pulling the bug fix from #26 I double-checked calculate_structure_function_3d and the traditional structure functions are calculated correctly already, so no updates necessary.

[cassidymwagner]

Since all of the tests pass I'm going to merge this now and continue working on any documentation or further testing either in #23 or a new branch, respectively.