[FEAT] multi-threaded rebuilds

[ghost]

Is your feature request related to a problem? Please describe.

I am rebuilding a large project, and this takes some time (more than a minute). I have a pretty strong CPU, and it looks like apktool is only using a single CPU core, while there are many more unused.

Describe the solution you'd like

I would like to see apktool use multiple threads, preferably with a way to choose how many (defaulting to 1).

Additional context

[AndnixSH]

This would be neat. I have strong CPU as well

[iBotPeaches]

I'll be honest. I don't have the knowledge to do this and it would additionally require correctly calling aapt/aapt2 in a threaded environment which I do not know if possible.

I'll throw it on the roadmap and close this.

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