rework likelihoodratio test to be just a pretty-printing wrapper around lrtest

[palday]

closes #818. closes #633

This has been needlessly confusing for a lot of people, I think, so now the only difference is in the display methods.

• add entry in NEWS.md
• after opening this PR, add a reference and run docs/NEWS-update.jl to update the cross-references.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.45%. Comparing base (6841af6) to head (54b2546).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #858      +/-   ##
==========================================
+ Coverage   95.41%   95.45%   +0.04%     
==========================================
  Files          38       38              
  Lines        3710     3699      -11     
==========================================
- Hits         3540     3531       -9     
+ Misses        170      168       -2     

Flag	Coverage Δ
current	95.15% <98.57%> (+0.06%)	⬆️
minimum	95.45% <100.00%> (+0.04%)	⬆️

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