rolling prod more accurate

[jangorecki]

closes #7349

• use more numerically stable algo for prod fast
• adaptive prod fast redirects to exact
  while it feels ok for adaptive=T/F to have an impact on accuracy, the partial=T/F should not, and because of how partial is implemented, by redirect to adaptive, and because adaptive prod fast was suffering numerical stability due to cumulative prod (new tests added here also detects that), I decided to remove adaptive prod fast and use exact instead. Tips on possible implementation have been provided in the code.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.10%. Comparing base (cf898ab) to head (877dbee).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7351      +/-   ##
==========================================
- Coverage   99.10%   99.10%   -0.01%     
==========================================
  Files          84       84              
  Lines       16128    16114      -14     
==========================================
- Hits        15983    15969      -14     
  Misses        145      145              

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