feat: add `unsigned` support

[Parsa307]

Feature description

--unsigned command in CLI

Motivation

If the user has signature verification disabled, they could copy over the original signatures over to patched apk.

Acknowledgements

• I have checked all open and closed feature requests and this is not a duplicate.
• I have chosen an appropriate title.

[LisoUseInAIKyrios]

This would be for users with modded roms that can spoof signature verification?

[Parsa307]

This would be for users with modded roms that can spoof signature verification?

Yes, is better to add this support, for users who want to avoid mounting.

ReVanced did deny an PR, that was planning to add it:
ReVanced/revanced-cli#130

Sumo unfortunately denied this feature:
ReVanced/revanced-cli#129