add middleware_position feature in django

Author: TheAnshul756

instrumentation/opentelemetry-instrumentation-django/src/opentelemetry/instrumentation/django/__init__.py

@@ -355,10 +355,18 @@ def _instrument(self, **kwargs):
 
         is_sql_commentor_enabled = kwargs.pop("is_sql_commentor_enabled", None)
 
+        middleware_position = kwargs.pop("middleware_position", 0)
+        if len(settings_middleware) < middleware_position:
+            _logger.debug(
+                "The middleware_position you provided (%d) is less than the current number of middlewares (%d). \
+                    Since the number of middlewares is less than the total, the Otel middleware will be appended at the end of the middleware chain.",
+                middleware_position, len(settings_middleware)           
+            )
+            middleware_position = len(settings_middleware)
         if is_sql_commentor_enabled:
-            settings_middleware.insert(0, self._sql_commenter_middleware)
+            settings_middleware.insert(middleware_position, self._sql_commenter_middleware)
 
-        settings_middleware.insert(0, self._opentelemetry_middleware)
+        settings_middleware.insert(middleware_position, self._opentelemetry_middleware)
 
         setattr(settings, _middleware_setting, settings_middleware)