add height quantile option to integrate_profile()

[adokter]

Adds an argument height_quantile to integrate_profile(), which allows calculation of specific height quantiles for the height data column of the output vpi object. height_quantile should have a value between 0-1, with 0=0% percentile closest to the ground, 1=100% percentile furthest from the ground). The default height_quantile=NA continues to output the mean height. height_quantile=0.5 gives the median height.

[adokter]

Hi @peterdesmet, no need to review this if you are short on time

I keep running into issues with the snaps in _snaps - my machine wants to update them, but I have to revert to the old ones in order to pass the unit tests on github. Any idea why this happens?

[codecov-commenter]

Codecov Report

Merging #485 (f0cf26e) into master (c901cab) will decrease coverage by 0.27%.
The diff coverage is 34.14%.

@@            Coverage Diff             @@
##           master     #485      +/-   ##
==========================================
- Coverage   57.62%   57.34%   -0.28%     
==========================================
  Files          55       55              
  Lines        3094     3130      +36     
==========================================
+ Hits         1783     1795      +12     
- Misses       1311     1335      +24     

Impacted Files	Coverage Δ
R/integrate_profile.R	72.45% <34.14%> (-10.76%)	⬇️

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