feat: add C++ JSI interface and Executorch dependency

[JakubGonera]

Description

Add C++ JSI interface and Executorch dependency for Android and iOS.

For Android:

• Add CMake integration for building C++ code.
• Add JSI installer that is called from Kotlin via JNI.
• Add Executorch C++ dependency by a dynamic library extracted from the .aar provided by an Executorch script.

For iOS:

• Add JSI installer in Objective C++.
• Modify the podspec to statically link Executorch. The binaries are extracted from the xcframeworks provided by an Executorch script.

Files in common/ are included automatically for Android, for iOS add a reference to them in Xcode.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (improves or adds clarity to existing documentation)

Tested on

• iOS
• Android

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings

[msluszniak]

C++ part looks good :))