[REQ] [Gradle] Support Gradle Cache for Gradle Plugin "org.openapi.generator"

Created by: HenningWaack

Description

The Gradle Plugin "org.openapi.generator" does not support caching, since build inputs and outputs are not declared and the task types are not cachable, see https://docs.gradle.org/current/userguide/custom_gradle_types.html and https://docs.gradle.org/current/userguide/build_cache.html#sec:task_output_caching_details

openapi-generator version

v4.x

Steps to reproduce

Run gradle openApiGenerate --info multiple times. The generator tasks are executed every time, no caching is done.

Suggest a fix/enhancement

Enhance current Gradle plugin to support Caching by declaring @Input and @OutputDirectory annotations.