Add JSON xcframework to distribution.

[tomball]

The org.json package was split into a separate library in j2objc-2.7, so there needs to be a matching xcframework built.

[Giorgioshooter]

Hello. If you do not mind me asking, what is the plan for this issue? Are you planning to action this soon? I am asking as we are trying to make our project work for M1 and unless I am mistaken we need to use the frameworks instead of the libs to achieve this.