@Override
    public void execute(PluginContext context) {
        NodeMapper mapper = new NodeMapper();
        T config = mapper.deserialize(context.getSettings(), getConfigType());
        executeWithConfig(context, config);
    }
Gets the configuration class type.

<p>The referenced {@code configType} class must be a public POJO with a
public, zero-arg constructor, getters, and setters. If the POJO has a
public static {@code fromNode} method, it will be invoked and is
expected to deserialize the Node. If the POJO has a public static
{@code builder} method, it will be invoked, setters will be called
on the builder POJO, and finally the result of calling the
{@code build} method is used as the configuration type. Finally,
the deserializer will attempt to create the type and call setters on
it that correspond to property names.

@return Returns the configuration class (a POJO with setters/getters).
smithy-build/src/main/java/software/amazon/smithy/build/plugins/ConfigurableSmithyBuildPlugin.java