feat(arrow-position): arrowIconPosition property addition

[thegdznet]

Hi and many thanks for Your work.

For the project I'm working on, I added arrowIconPosition to be able to place it to the left.

Fell free to accept or reject this PR.

Guillaume.

PS: List animation is coming...

[thegdznet]

I can change LEFT/RIGHT to START/END if You prefer.

[mikehardy]

I think that's a real question of taste with @hossein-zare - I personally would remove it and make it RTL aware but I also haven't checked what the performance impact of that would be, or even if that's really wanted 🤷 - but I'm curious what Hossein thinks

[hossein-zare]

The wrapper TouchableOpacity is RTL aware so START and END are ok as far as i know. The themes should also be updated as @mikehardy noted here:

I have noticed that a lot of RTL-aware components, and react-native itself, has attempted to use "start" and "end" for positioning vs the non-RTL-aware words "left" or "right"...

I'll merge your PR after getting things done.

https://github.com/hossein-zare/react-native-dropdown-picker/blob/ae12571c27419f623f93ee1d0327c84ff2e78f3a/src/components/Picker.js#L727-L733

https://github.com/hossein-zare/react-native-dropdown-picker/blob/ae12571c27419f623f93ee1d0327c84ff2e78f3a/src/components/Picker.js#L1739

[Angelk90]

@thegdznet : What do you mean by list animation?