feat: Adopt pyproject.toml for Project Improvement

[iconFehu]

Note:

• Version Setting: This change will now read the version from the opcodes.__version__ variable to ensure consistency in versioning across the codebase.

• README Update: This change also involves updating the README.md file to reflect the latest state of the project and usage instructions.

• Dependency Update: Dependencies will now be read from the requirements.txt file, facilitating easier management of project dependencies.

These changes aim to enhance the maintainability and consistency of the project while ensuring synchronization across various components. Thank you for your review and merge.