Refactor Agent to Eliminate Global Variables and Enhance Readability

[Repsay]

This pull request introduces a comprehensive refactor of the hashtopolis/agent-python codebase with the following objectives:

• Elimination of Global Variables: Transitioned from using global variables to encapsulating functionality within an Agent class. This approach enhances modularity and maintainability.
• Codebase Simplification: Streamlined various components to reduce complexity, resulting in cleaner and more efficient code.
• Improved Readability: Reorganized and reformatted code to adhere to consistent style guidelines, making it more readable and easier to navigate.

Given the interdependencies among these changes, separating them into distinct pull requests would require significant additional effort. Therefore, they are consolidated here to maintain coherence and ensure stability.

This refactor lays the groundwork for future enhancements and facilitates easier maintenance. Developers are encouraged to review the changes thoroughly and provide feedback or raise concerns as necessary.