Radially-averaged topset size and slope

[amoodie]

draft of two metrics on topset. both use equally-spaced radial sections to sample the data.

DEPENDS ON #130

Metrics implemented:

• topset slope
• topset size (i.e., radius)
• shoreline rugosity

todo

• finish PR Create sections into objects other than cube (mask, plan, arrays) #130
• documentation
• exmaples
• tests

[codecov]

Codecov Report

Merging #132 (e2f84b4) into develop (36bce2c) will decrease coverage by 2.19%.
The diff coverage is 90.69%.

@@             Coverage Diff             @@
##           develop     #132      +/-   ##
===========================================
- Coverage    89.29%   87.10%   -2.19%     
===========================================
  Files            8        9       +1     
  Lines         3027     3545     +518     
===========================================
+ Hits          2703     3088     +385     
- Misses         324      457     +133     

Impacted Files	Coverage Δ
deltametrics/plan.py	80.47% <90.69%> (-8.74%)	⬇️
deltametrics/section.py	95.01% <0.00%> (-0.31%)	⬇️
deltametrics/plot.py	89.66% <0.00%> (-0.04%)	⬇️
deltametrics/cube.py	81.70% <0.00%> (ø)
deltametrics/mask.py	87.50% <0.00%> (+0.01%)	⬆️

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