Replace SwiftCLI Task with Bash command

[tthbalazs]

I quickly replaced the Task command from SwiftCLI with Bash. The API is similar but not exactly the same, there is no differentiation between captured / not captured output.

It also does not do async output at the moment, and I'm wondering if the sync one is correct at all 🤔

Anyway, it should be easy to build on top of this

[arthurpalves]

I was checking this and there is a huge decrease in performance, of about 920%+ 🤔

Command

time swift run badgy long XYZ ~/Desktop/TestIcon.appiconset/ \
--color '#DDE4E9' --tint-color '#222222' --angle 15 --replace

Results

master (Pure SwiftCLI)

real	0m7.592s
user	0m8.788s
sys	0m1.090s

rc-argument-parser (ArgumentParser + SwiftCLI.Task)

real	0m7.875s
user	0m8.858s
sys	0m1.080s

tthbalazs:add-bash-command (ArgumentParser + Bash)

real	1m10.434s
user	0m43.044s
sys	0m22.991s

For this reason alone I think we can't merge this yet.