Implemented R-Precision for IR

[lucadiliello]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #574 .

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Merging #577 (1263468) into master (40007e9) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #577   +/-   ##
=====================================
- Coverage      95%    95%   -0%     
=====================================
  Files         144    146    +2     
  Lines        5032   5052   +20     
=====================================
+ Hits         4787   4805   +18     
- Misses        245    247    +2     

[SkafteNicki]

LGTM :]
Great work @lucadiliello

[Borda]

Great work!