Add a data class for grouping PR related data

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #2305 (b7f16fe) into master (cd2aa23) will increase coverage by 0.42%.
The diff coverage is 54.28%.

@@            Coverage Diff             @@
##           master    #2305      +/-   ##
==========================================
+ Coverage   78.04%   78.47%   +0.42%     
==========================================
  Files         137      136       -1     
  Lines        2300     2290      -10     
  Branches       59       55       -4     
==========================================
+ Hits         1795     1797       +2     
+ Misses        505      493      -12     

Impacted Files	Coverage Δ
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	0.00% <0.00%> (ø)
...cala/org/scalasteward/core/update/PruningAlg.scala	91.42% <0.00%> (ø)
...la/org/scalasteward/core/application/Context.scala	77.58% <100.00%> (ø)
...lasteward/core/nurture/PullRequestRepository.scala	100.00% <100.00%> (+7.14%)	⬆️
...rg/scalasteward/core/nurture/PullRequestData.scala

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