feat: add transition duration on iOS

[WoLewicki]

Description

Added transition duration on iOS requested in #1171.

The prop changes the duration of slide_from_bottom, fade_from_bottom, fade and simple_push transitions on iOS. The duration of default and flip transitions isn't customizable.

Such prop could be also added on Android, but each of fragments have its own transition duration, so the way it should be applied would need to be thought over. One of options is to set the duration of currently added or currently removed fragment on both of them.

Test code and steps to reproduce

Test1259.tsx in TestsExample/ project

Checklist

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

[tomekzaw]

🚀

[d-moreira]

Hi @WoLewicki,

are there any plans to add support for transition duration on Android in the near future?

[hirbod]

Could you guys also push the new props to react-navigation please? ❤️