feat(cli): show individual and total test execution times

[wellwelwel]

Closes #30.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.21%. Comparing base (94049fd) to head (66bf95e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   95.13%   95.21%   +0.08%     
==========================================
  Files          33       34       +1     
  Lines        2714     2802      +88     
  Branches      421      434      +13     
==========================================
+ Hits         2582     2668      +86     
  Misses        125      125              
- Partials        7        9       +2     

Flag	Coverage Δ
linux-parallel	94.89% <100.00%> (+0.16%)	⬆️
linux-parallel-options	95.18% <100.00%> (+0.15%)	⬆️
linux-sequential	?
linux-sequential-options	?
osx-parallel	?
osx-parallel-options	95.18% <100.00%> (+0.15%)	⬆️
osx-sequential	?
osx-sequential-options	?
windows-parallel	?
windows-parallel-options	?
windows-sequential	?
windows-sequential-options	?

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