NEW prob change to prob functions

[mattansb]

Closes #568

• OR to prob
• logOR to prob
• RR to prob
• ARR to prob
• NNT to prob

@strengejacke @bwiernik

• Do we also want the inverse of these? (e.g., prob to OR)
• Do we also want conversion to odds? (e.g., NNT to odds)

[codecov-commenter]

Codecov Report

Merging #575 (90034d7) into main (01b59a5) will decrease coverage by 0.33%.
The diff coverage is 0.00%.

❗ Current head 90034d7 differs from pull request most recent head 4096bac. Consider uploading reports for the commit 4096bac to get more accurate results

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@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   90.57%   90.25%   -0.33%     
==========================================
  Files          55       56       +1     
  Lines        3374     3386      +12     
==========================================
  Hits         3056     3056              
- Misses        318      330      +12     

Impacted Files	Coverage Δ
R/convert_between_riskchange_ro_probs.R	0.00% <0.00%> (ø)

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