moved static class inside main class

Author: inemtsev

modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache

@@ -53,7 +53,10 @@ import java.util.function.Consumer;
 import java.util.concurrent.CompletableFuture;
 {{/asyncNative}}
 
-static class HttpRequestBuilderExtensions {
+{{>generatedAnnotation}}
+{{#operations}}
+public class {{classname}} {
+  private static class HttpRequestBuilderExtensions {
     static HttpRequest.Builder withAdditionalHeaders(HttpRequest.Builder builder, Map<String, String> headers) {
         if (headers != null) {
             for (Map.Entry<String, String> entry : headers.entrySet()) {
@@ -62,11 +65,7 @@ static class HttpRequestBuilderExtensions {
         }
         return builder;
     }
-}
-
-{{>generatedAnnotation}}
-{{#operations}}
-public class {{classname}} {
+  }
   private final HttpClient memberVarHttpClient;
   private final ObjectMapper memberVarObjectMapper;
   private final String memberVarBaseUri;