Enh: Generalize dashboards

[Vialeon]

create package to generalize dashboard building and implement on current dashboards Add helper functions to offload datetime pretty printing calculations to sql queries

[codecov[bot]]

Codecov Report

Merging #260 (7707223) into main (4aa8215) will decrease coverage by 1.18%. The diff coverage is 15.87%.

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
- Coverage   70.51%   69.32%   -1.19%     
==========================================
  Files          52       54       +2     
  Lines        2934     2993      +59     
==========================================
+ Hits         2069     2075       +6     
- Misses        547      600      +53     
  Partials      318      318              

Impacted Files	Coverage Δ
extensions/internal/helpers/timediff.go	5.71% <5.71%> (ø)
extensions/internal/helpers/print_duration.go	9.09% <9.09%> (ø)
extensions/internal/helpers/helpers.go	75.00% <100.00%> (+3.57%)	:arrow_up:

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[patrickdevivo]

seems to be result of this issue: https://github.com/mergestat/gitutils/issues/5 where we return a nil blame line when we shouldn't (on empty files)