276 create summary stats

[maciekbanas]

Create get_*_stats functions as a bridge between pull_* and plots.
Plots have been refactored to be a generic gitstats_plot which takes as an input table classes repos_stats or commits_stats.
All comments and opinions are welcome.

New example workflow is in the vignette.

[codecov-commenter]

Codecov Report

Patch coverage: 81.40% and project coverage change: +5.60% 🎉

Comparison is base (1081673) 75.40% compared to head (c97b96f) 81.00%.
Report is 126 commits behind head on devel.

❗ Current head c97b96f differs from pull request most recent head 2ecbc63. Consider uploading reports for the commit 2ecbc63 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #300      +/-   ##
==========================================
+ Coverage   75.40%   81.00%   +5.60%     
==========================================
  Files          12       15       +3     
  Lines         992     1553     +561     
==========================================
+ Hits          748     1258     +510     
- Misses        244      295      +51     

Files Changed	Coverage Δ
R/GQLQueryGitHub.R	81.81% <61.11%> (-14.11%)	⬇️
R/GitHost.R	62.65% <64.86%> (+17.75%)	⬆️
R/EngineGraphQLGitHub.R	78.82% <73.13%> (-5.44%)	⬇️
R/EngineGraphQLGitLab.R	79.34% <79.34%> (ø)
R/EngineRestGitHub.R	75.30% <81.54%> (+2.08%)	⬆️
R/GQLQueryGitLab.R	82.35% <82.35%> (ø)
R/EngineRestGitLab.R	83.10% <84.21%> (-2.74%)	⬇️
R/GitStats.R	77.85% <85.10%> (+12.06%)	⬆️
R/test_helpers.R	94.87% <90.47%> (+11.53%)	⬆️
R/EngineRest.R	94.87% <93.75%> (+1.22%)	⬆️
... and 5 more

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[marcinkowskak]

Looks good, went through workflow without problems :)