Install Dart SDK

[TaH00R]

Description

Add support for installing the Dart SDK through Dev Setup.

The installer should verify whether Dart is already installed before attempting installation.

Acceptance Criteria

• Detect existing Dart SDK installation
• Install the latest stable Dart SDK
• Verify installation using dart --version
• Display installation status to the user
• Update documentation if necessary

Additional Notes

This feature serves as a prerequisite for Flutter development support.