[BUG][java-helidon-server] Use of format binary leads to code with missing import

Description

When using a schema with type:string and format:binary, the generated code is missing the import for java.io.InputStream, so the code can not be compiled

openapi-generator version

7.8.0 gradle plugin

OpenAPI declaration file content or url

bugs.json

Generation Details

Generated via the gradle plugin

openApiGenerate {
    generatorName.set("java-helidon-server")
    inputSpecRootDirectory.set("$rootDir/specs/")
    outputDir.set("$rootDir/src")
    apiPackage.set("my.package.api")
    modelPackage.set("my.package.model")
    invokerPackage.set("my.package.api.services")
    validateSpec.set(true)
    generateApiTests.set(false)
    configOptions.set([
            apiPackage          : "my.package.services",
            modelPackage        : "my.package.model",
            invokerPackage        : "my.package.services",
            dateLibrary         : "java8",
            gradleProject       : "true",
            groupId             : "my.package",
            artifactId          : "example",
            library             : "se",
            helidonVersion      : "$helidonVersion",
            serializationLibrary: "jackson",
            fullProject         : "false",
            useAbstractClass    : "true",
            "x-helidon-groupBy" : "first-path-segment"
    ])
}

Steps to reproduce

Use the java-helidon-server plugin to generate the server implementation

Start with the linked bugs.json OpenAPI declaration and reproduce generation through the java-helidon-server Gradle plugin using the shown configuration. Inspect the generated server sources and the generator entry points for binary string handling. Done means the generated code for format:binary includes the required java.io.InputStream import and compiles.