Add native RTL support for bottom tabs on iOS & Android with optional direction override

[ahmedawaad1804]

##Description

This PR adds proper RTL (Right-to-Left) layout support for native bottom tabs on both iOS and Android in react-native-screens.

Previously, bottom tabs did not automatically follow the system RTL direction, which caused incorrect tab ordering and layout in RTL locales (e.g. Arabic, Hebrew).

With this change:

Bottom tabs now follow the system layout direction by default

A new optional direction prop allows forcing LTR or RTL explicitly from JS when needed

This brings native behavior in line with expected platform RTL handling and React Native layout conventions.

##Changes

Added automatic RTL detection in native bottom tabs (iOS & Android)

Synced tab layout direction with system layout direction by default

Introduced optional direction prop:

"ltr" – force left-to-right

"rtl" – force right-to-left

default: system value

Updated native layout logic to correctly reverse tab ordering in RTL mode

add example in Test3598.tsx

Before

in RTL it was

After

-->
now

Test plan

Tested on:

Android (RTL system language enabled)

iOS (RTL simulator + device)
use example Test3598.tsx

Checklist

• Included code example that can be used to test this change.
• Updated / created local changelog entries in relevant test files.
• For visual changes, included screenshots / GIFs / recordings documenting the change.
• For API changes, updated relevant public types.
• Ensured that CI passes