Refactor report generation and logging handlers.

Introduced `CustomLogsHandler` to streamline log management and updated `ReportGenerator` to simplify report generation output. Removed unused asynchronous iterator methods, improving code clarity and reducing complexity.

src/main.py

@@ -37,7 +37,8 @@ async def get_report_endpoint(request: ReportRequest):
         try:
             # Call the asynchronous get_report function
             generator = ReportGenerator(request.query, request.report_type)
-            await generator.generate_report()
+            custom_logs_handler = await generator.generate_report()
+            yield "Report generation completed successfully!\n"
         except Exception as e:
             yield f"Error: {str(e)}"