forked from loafle/openapi-generator-original
* upgrade java native to junit5 * upgrade build.gradle, optimize imports * upgrade gradle, re-generate samples * migrate api_test.mustache and petstore tests of native-async & native-jakarta
* upgrade java native to junit5 * upgrade build.gradle, optimize imports * upgrade gradle, re-generate samples * migrate api_test.mustache and petstore tests of native-async & native-jakarta