refactor!: drop support for native-stack v5

[kkafar]

Description

This PR intents to remove native-stack v5 implementation from the repository.

Plan:

1. Remove public /native-stack directory
2. Remove implementation in src/native-stack/ directory
3. Remove all references in docs to native-stack@v5
4. Remove all in-code references to native-stack@v5

Caution

2 & 4 require some more work to be done, because screen transitions API code (integration with reanimated) makes use of API exposed by native-stack@v5.

I need to figure out how to decouple these first.

Changes

Above ^

Test code and steps to reproduce

N/A

Checklist

• Included code example that can be used to test this change
• Updated TS types
• Updated documentation:
  • https:/software-mansion/react-native-screens/blob/main/guides/GUIDE_FOR_LIBRARY_AUTHORS.md
  • https:/software-mansion/react-native-screens/blob/main/native-stack/README.md
  • https:/software-mansion/react-native-screens/blob/main/src/types.tsx
  • https:/software-mansion/react-native-screens/blob/main/src/native-stack/types.tsx
• Ensured that CI passes