[Java][jaxrs/resteasy] add @Valid to getter methods when bean validation is enabled

[tnmtechnologies]

Description

When bean validation is enabled, @Valid misses on getter methods of model classes.

It is ok for the api part thanks to #1237 .

openapi-generator version

Issue found in version 3.3.3

OpenAPI declaration file content or url

Command line used for generation

Steps to reproduce

Related issues/PRs

#1237
#1019

Suggest a fix

I think that what has been done for the fix #1019 for models should be done in models of the resteasy server generator.