chore: prepare repo for Apple Silicon

[kacperkapusciak]

Description

This PR makes sure that example project used to test react-native-screens compile on Apple arm64 chips.

Added a few config lines to Podfile needed to compile iOS code. Thanks to facebook/react-native#31941.
Android doesn't need any changes due to recent gradle bump to 6.9 in #1042

Test code and steps to reproduce

cd TestsExample/
yarn # install packages
cd ios && pod install && cd .. # install pods
yarn start # start metro
# in separate terminal
npx react-native run-android # build Android
npx react-native run-ios # build iOS

Same for Example/ ⬆️

Projects should compile on both arm and intel-based processors

Checklist

• Ensured that CI passes

[WoLewicki]

It build on my intel mbp, so I think we can merge it 🎉

[mikehardy]

Just a note since I'm trying to drive the needed iOS changes all over, and into the main repo - it looks like 0.66 won't need the workaround: react-native-community/releases#246 (comment) - so I'm not sure on timing for screens releases or whether you want to make sure you work on react-native 0.65 or not, but at minimum you might add a note to remove this for 0.66 since it'll be upstreamed.

And thanks for screens by the way, it's in all my projects

[kacperkapusciak]

@mikehardy thank you!
I've added a note in 2733adf