[DART] Add standard generated classes as reserved (#8975)

* [DART] Add standard generated classes as reserved

* Move StreamedRequest into dart client

Author: sbu-WBT

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java

@@ -17,6 +17,7 @@
 
 package org.openapitools.codegen.languages;
 
+import com.google.common.collect.Sets;
 import org.openapitools.codegen.CliOption;
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.SupportingFile;
@@ -37,6 +38,19 @@ public class DartClientCodegen extends AbstractDartCodegen {
     public DartClientCodegen() {
         super();
 
+        additionalReservedWords.addAll(
+                Sets.newHashSet(
+                        "StreamedRequest",
+                        "ApiClient",
+                        "QueryParam",
+                        "Authentication",
+                        "HttpBasicAuth",
+                        "HttpBearerAuth",
+                        "ApiKeyAuth",
+                        "OAuth"
+                )
+        );
+
         final CliOption serializationLibrary = new CliOption(CodegenConstants.SERIALIZATION_LIBRARY,
                 "Specify serialization library");
         serializationLibrary.setDefault(SERIALIZATION_LIBRARY_NATIVE);