feat(adjust): add support for sdk signature

[youedd]

Why

To implement Adjust SDK Signature, the Adjust team generates and provides two custom libraries that need to be integrated in the iOS and Android native projects.

This PR aims to add support for that.

How

if the sdk signature library path is specified:

iOS

• copy the sdk signature framework to the ios project folder
• embed and sign the sdk signature framework

Android

• copy the sdk signature aar to android/app/libs
• add required ndk.abiFilters
• add aar file as a dependency

Test Plan

Tested locally on an existing project

[smisaacs]

anyone have a chance to look at this?

[naveen-adss]

@youedd could you rebase your branch with latest main ? Also a nit pick fix is to correct the indentation that is being seen in your screenshots to make things look clean.