Add rtl prop to more controls

[ndonkoHenri]

Fixes #3637

Summary by Sourcery

This pull request introduces the rtl property to several controls to support right-to-left layouts, fixes an assertion in NavigationRail, and includes various refactorings to streamline control creation and logic.

• New Features:
  • Added rtl (right-to-left) property to various controls including NavigationRailDestination, NavigationRail, AppBar, CupertinoAppBar, and NavigationDrawer to support right-to-left layouts.
• Bug Fixes:
  • Fixed an assertion in NavigationRail to ensure elevation must be greater than 0.
• Enhancements:
  • Refactored the creation of AppBar, CupertinoAppBar, NavigationRail, and NavigationDrawer controls to use a more concise and consistent approach.
  • Simplified conditional checks and control creation logic in CupertinoBottomSheet and NavigationDrawer.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds the rtl (right-to-left) property to various controls across the codebase, ensuring better support for right-to-left languages. Additionally, it refactors some existing code for better readability and maintainability.

File-Level Changes

Files	Changes
sdk/python/packages/flet-core/src/flet_core/navigation_rail.py sdk/python/packages/flet-core/src/flet_core/app_bar.py sdk/python/packages/flet-core/src/flet_core/cupertino_app_bar.py sdk/python/packages/flet-core/src/flet_core/navigation_drawer.py	Added rtl property to various controls to support right-to-left languages.
packages/flet/lib/src/controls/app_bar.dart packages/flet/lib/src/controls/cupertino_app_bar.dart packages/flet/lib/src/controls/navigation_rail.dart packages/flet/lib/src/controls/navigation_drawer.dart	Refactored control classes to directly use control attributes within widget initializations, improving code readability and maintainability.

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[sourcery-ai]

Hey @ndonkoHenri - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 3 issues found
• 🟢 Security: all looks good
• 🟡 Testing: 1 issue found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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