fix(disputelp.ts) - input validation, improved loging

[cryptoryda]

• Input validation: Added basic checks for essential values like RPCProviderUrl, NFTContractAddress, etc.
• Code structure: Added helper methods to keep the main function cleaner.
• Logging: Improved log messages for better debugging and clarity.
• Error handling: Added try-catch blocks for error handling to make the script more robust.

[cryptoryda]

@jacob-tucker
Let me know if you have any questions about this PR Thanks