feat : algorithm improvements

- use FastStitchProcessor when the canvas is either large, tall or wide (original algorithm)
- introduce StreamingProcessor algorithm for better robust performance
- add logger

appsettings.Development.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "StitcherApi": "Debug"
     }
   }
 }