Feat/add scroll commands android

[rezaansari7]

Add Scroll Commands for Web and Android Native Apps

This PR adds TypeScript type definitions for scroll commands to support both web and Android native app automation.

Changes

• Added ScrollOptions and ScrollToOptions interfaces for web scroll commands
• Added AndroidScrollOptions interface for Android native app scroll commands
• Added the following methods to NightwatchBrowser interface:
  • Web scroll commands:
    • scrollTo: Scrolls to specific coordinates
    • scrollIntoView: Scrolls an element into view
    • scrollToBottom: Scrolls to the bottom of the document
    • scrollToTop: Scrolls to the top of the document
  • Android native app scroll commands:
    • androidScroll: Scrolls in specified direction
    • androidScrollToElement: Scrolls to specific elements

Testing

• Added comprehensive JSDoc comments for better documentation
• Type definitions follow existing patterns in the codebase
• All changes are backward compatible