Vignette for use of ppc*pit_ecdf() with new method argument

[florence-bockting]

Fixes #513

Description

This PR introduces a new vignette demonstrating the use of the ppc_pit_ecdf(), ppc_loo_pit_ecdf(), and ppc_pit_ecdf_grouped() functions. Specifically, it covers the new implementation introduced in #428, which added support for dependence-aware uniformity tests.

The vignette focuses on the newly introduced arguments and provides examples of how to interpret the correlation-aware ECDF plots.

TODO

• Merge Dependence aware tests for ppc*ecdf #428
• Create vignette as online-only article

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.83%. Comparing base (ad9a76f) to head (9a06cb2).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
+ Coverage   98.79%   98.83%   +0.03%     
==========================================
  Files          35       35              
  Lines        6582     6583       +1     
==========================================
+ Hits         6503     6506       +3     
+ Misses         79       77       -2     

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[jgabry]

@florence-bockting is this ready for review now that #428 was merged?

[florence-bockting]

@florence-bockting is this ready for review now that #428 was merged?

Thanks for pinging me. I checked the vignette again and made some final adjusts.
Good for review now. Thank you.

[jgabry]

This is great, thanks @florence-bockting. Just a couple of very minor things.

What was the reason for making this online only? I'm fine with this being an online only vignette, just curious. (It's probably for the best, since with all the images in the other vignettes we're already pushing CRAN's package size limits, if I remember correctly.)

[florence-bockting]

This is great, thanks @florence-bockting. Just a couple of very minor things.

What was the reason for making this online only? I'm fine with this being an online only vignette, just curious. (It's probably for the best, since with all the images in the other vignettes we're already pushing CRAN's package size limits, if I remember correctly.)

Mainly because I use patchwork for plotting and I don't want to introduce it to Suggests.