public void integrationSettings(ObjectNode integrationSettings) {
        this.integrationSettings = Objects.requireNonNull(integrationSettings);
    }
Sets the settings node to be passed to integrations.

<p>Generators MUST set this with the {@code integrations} key from their
plugin settings.

<pre>{@code
{
    "version": "1.0",
    "projections": {
        "codegen-projection": {
            "plugins": {
                "code-generator": {
                    "service": "com.example#DocumentedService",
                    "integrations": {
                        "my-integration": {
                            "example-setting": "foo"
                        }
                    }
                }
            }
        }
    }
}
}</pre>

<p>In this example, the value of the {@code integrations} key is what must
be passed to this method. The value of the {@code my-integration} key will
then be provided to an integration with the name {@code my-integration}.

@param integrationSettings Settings used to configure integrations.
smithy-codegen-core/src/main/java/software/amazon/smithy/codegen/core/directed/CodegenDirector.java