[maven-plugin] no "serializableModel" option in swagger-codegen-maven-plugin available

Description

As the title suggested is there no option to add "implements Serializable" for the generated models in the maven-plugin, like it is in the normal cli with serializableModel=true.

Swagger-codegen version

I tried

<groupId>io.swagger</groupId>
<artifactId>swagger-codegen-maven-plugin</artifactId>
<version>2.3.1</version> 

and

<groupId>io.swagger.codegen.v3</groupId>
<artifactId>swagger-codegen-maven-plugin</artifactId>
 <version>3.0.18</version>

Command line used for generation

No command line, but build with maven. There the option is missing.

Steps to reproduce

Try to set the option in the config in maven pom.xml

Suggest a fix/enhancement

Add this option to the maven-plugin? It is already there in the cli, so I think it can be easily done?

Start in the swagger-codegen-maven-plugin configuration and compare its available options with the CLI's serializableModel option. Trace how the Maven plugin passes configuration to generation, then verify that enabling the option produces generated models implementing Serializable.