Refactor project structure and enhance Docker support

- Removed unnecessary `__init__.py` and `Dockerfile` to streamline project organization.
- Updated `.dockerignore` and `.gitignore` to improve exclusion patterns for build artifacts and environment files.
- Enhanced `Makefile` with new commands for managing Docker containers and added help documentation.
- Introduced `pyproject.toml` for better project metadata management and dependency tracking.
- Updated `requirements.txt` to reflect changes in dependencies for metrics and monitoring.
- Refactored various handler files to improve code organization and maintainability.

requirements-dev.txt

@@ -0,0 +1,13 @@
+# Development and testing dependencies
+-r requirements.txt
+
+# Testing
+pytest>=8.0.0
+pytest-asyncio>=0.23.0
+pytest-cov>=4.0.0
+coverage>=7.0.0
+
+# Development tools
+black>=23.0.0
+flake8>=6.0.0
+mypy>=1.0.0