Add support of typescript

[umidjon-2231]

This pull request introduces TypeScript definitions (type.d.ts) for html2pdf.js, allowing developers to use the library with improved type safety and better IDE support.

Changes Included:

• Created a TypeScript declaration file (type.d.ts) with comprehensive type definitions for the library.
• Added typings for Html2PdfOptions, Html2PdfWorker, and Html2PdfStatic.
• Ensured all documented methods and parameters are typed correctly.
• Included JSDoc comments for better documentation.

Motivation & Benefits:

• Enables TypeScript developers to use html2pdf.js with type checking.
• Enhances code editor autocompletion and documentation.
• Reduces potential runtime errors by enforcing correct API usage.

How to Test:

1. Import the library in a TypeScript project:

   import html2pdf from "html2pdf.js";
   

2. Use the library with the new type definitions:

   const element = document.getElementById("element-to-print");
   html2pdf().from(element).set({ filename: "test.pdf" }).save();
   

3. Verify that TypeScript recognizes the method signatures and shows relevant hints in an IDE.

Looking forward to feedback and suggestions!