feat(commands): Add concurrency flag for task based commands

[tfriem]

fix #5

[codecov]

Codecov Report

Merging #12 into master will increase coverage by 0.74%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   83.75%   84.49%   +0.74%     
==========================================
  Files          12       13       +1     
  Lines         314      329      +15     
  Branches       43       45       +2     
==========================================
+ Hits          263      278      +15     
  Misses         51       51

Impacted Files	Coverage Δ
src/task-command.ts	100% <100%> (ø)
src/commands/switch-release.ts	96.15% <100%> (-0.15%)	⬇️
src/flags.ts	100% <100%> (ø)	⬆️
src/command-utils.ts	67.07% <100%> (+0.82%)	⬆️
src/commands/switch-subsystem.ts	97.5% <100%> (-0.07%)	⬇️

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[tfriem]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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