Add rrule for inv and corresponding tests

[lkdvos]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.68%. Comparing base (6578475) to head (f6c2ea1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
+ Coverage   82.66%   82.68%   +0.01%     
==========================================
  Files          43       43              
  Lines        5568     5573       +5     
==========================================
+ Hits         4603     4608       +5     
  Misses        965      965              

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[Jutho]

Do you understand the nightly tests? Otherwise looks good.

[lkdvos]

Looks like some internal problems with ChainRulesTestUtils to me, although I checked and there haven't really been any changes there. My guess would be it has something to do with changes to world age things etc, but I am not really following that all too closely so I can't say for sure. In any case, looks unrelated to this change :)

[Jutho]

Ok it is just annoying if nightly breaks the master branch, especially if we want to tag a version soon.