VSpot v4.0.0: Multi-step tours, Style API, and build system updates

• VSpotView Refactor: Completely refactored VSpotView and VSpotMessageView to support multi-step product tours, a new Step API, and a comprehensive Style system for UI customization.
• Performance Improvements: Optimized drawing logic to eliminate bitmap allocations within onDraw() and improved layout positioning.
• New Features: Added support for circular and rounded rectangle spotlight shapes, connector lines, pulse effects, and built-in navigation controls (Back, Next, Skip, Done).
• Build System: Updated Gradle to 9.4.1, Android SDK to 37, and added specialized scripts for Maven Central and JitPack publishing.
• Documentation: Overhauled README.md with detailed usage guides, migration instructions, and API documentation for version 4.0.0.
• Cleanup: Removed legacy MainActivity2 and temporary view implementations (VSpotView2, VSpotMessageView2).

• Improvements

• Added Support For Older Versions Android Upto API 15

Fixed issue in gradle

Fixed gradle issue

Resolved gradle issue