Add HideGenerationTimestamp getter and setter in the CodegenConfig interface (#8009)

Author: jmini

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenConfig.java

@@ -177,6 +177,10 @@ public interface CodegenConfig {
 
     void setRemoveOperationIdPrefix(boolean removeOperationIdPrefix);
 
+    public boolean isHideGenerationTimestamp();
+
+    public void setHideGenerationTimestamp(boolean hideGenerationTimestamp);
+
     Map<String, String> supportedLibraries();
 
     void setLibrary(String library);

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -3378,7 +3378,7 @@ public boolean isRemoveOperationIdPrefix() {
     public void setRemoveOperationIdPrefix(boolean removeOperationIdPrefix) {
         this.removeOperationIdPrefix = removeOperationIdPrefix;
     }
-    
+
     public boolean isHideGenerationTimestamp() {
         return hideGenerationTimestamp;
     }