feat(test runner): add concurrency limit option

[wellwelwel]

Closes #31.

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 92.41%. Comparing base (29c5f7a) to head (1bcbe62).

Files	Patch %	Lines
src/services/run-tests.ts	76.92%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   91.48%   92.41%   +0.92%     
==========================================
  Files          29       29              
  Lines        2266     2280      +14     
  Branches      281      306      +25     
==========================================
+ Hits         2073     2107      +34     
+ Misses        190      170      -20     
  Partials        3        3              

Flag	Coverage Δ
linux-nodejs	?
linux-parallel	91.22% <64.28%> (?)
linux-parallel-options	91.49% <64.28%> (?)
linux-sequential	89.86% <7.14%> (?)
linux-sequential-options	90.13% <7.14%> (?)
osx-nodejs	?
osx-parallel	91.22% <64.28%> (?)
osx-parallel-options	91.49% <64.28%> (?)
osx-sequential	89.86% <7.14%> (?)
osx-sequential-options	90.13% <7.14%> (?)
windows-nodejs	?
windows-parallel	90.70% <64.28%> (?)
windows-parallel-options	90.96% <64.28%> (?)
windows-sequential	89.34% <7.14%> (?)
windows-sequential-options	89.60% <7.14%> (?)

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