Refactor File Structure and Method Organization for Improved Modularity

[jrwbabylonlab]

The current file structure and organization of methods can be improved to enhance readability and maintainability. While this isn’t a priority before the testnet launch, it’s something we can address afterward.

Proposed Improvements:

1.	Refactor the main class to produce a custom-typed class instance, which would encapsulate methods like:
•	toPsbt
•	toTransaction
•	Other related functionality.
2.	Introduce static methods in the new class, such as fromTransaction, allowing for operations like toPsbt to be invoked on a well-structured instance.

These changes would make the codebase cleaner and more modular for future development.

Link to the conversation: #44 (comment)