Implemented a UI for SIP-010 Token Manager

[Hillzo]

Here are some of the things I implemented in the UI to make it robust and professional:

1. Modular structure: Components are separated into their own folders with their respective CSS modules.
2. Consistent styling: A professional color scheme is used throughout the application, with a focus on readability and user experience.
3. Responsive design: The layout adapts to different screen sizes.
4. Custom hook: useContractState manages the contract state and provides a way to update it.
5. Constants file: Shared values are kept in a separate file for easy management.
6. Form validation: Basic input validation is added to forms.
7. Error handling: There's a structure in place for handling errors and updating the UI accordingly.