RTL support

[xyn22]

Feature request

Why it is needed

Although locale support is great, it should be able to display in right-to-left. For example if format is "day month year" the year should be on the far left and day on the far right.

Possible implementation

1. A boolean prop would do.
2. We can have another option for dateFormat prop so it accepts year month day
3. A better implementation is to check if RTL is enabled through I18nManager.isRTL. I18nManager is a core react-native module.