Refactor TS SDK Codebase

[sahilsuman933]

The SDK code (index.ts) is currently mixed together in a single TypeScript file. As our project grows larger, it will become more complex and difficult to contribute to.

To address this, we propose refactoring the index.ts file into separate folders. For TypeScript types, we can create a dedicated folder and place the types there. Similarly, we can create a separate utils folder to contain all the files related to utilities, including the utils.ts file.