Add progress messages to report generation process

This change introduces status updates to indicate the start and successful completion of the report generation. These progress messages improve user feedback during the asynchronous operation.

src/main.py

@@ -36,6 +36,7 @@ async def get_report_endpoint(request: ReportRequest):
     async def generate_report():
         try:
             # Call the asynchronous get_report function
+            yield "Report generation started...\n"
             generator = ReportGenerator(request.query, request.report_type)
             custom_logs_handler = await generator.generate_report()
             yield "Report generation completed successfully!\n"