[REQ] [Java][Native] set httpClient to ApiClient class instead of only builder

Is your feature request related to a problem? Please describe.

I'm using openapi-generator for Java, and i'm using the native library. The problem i have is with instrumentation. I am able to somehow set it up with Micrometer, but everything i try gives me an instance of HttpClient. Unfortunately, i get only to set the builder with setHttpClientBuilder. Is there a way to set HttpClient directly that i'm not aware without possibility of hacky ways to do this?

Describe the solution you'd like

Having something like this

public ApiClient(HttpClient client) {
    this.client = client;
  }

Describe alternatives you've considered

I'm looking into using a different library, but would be ideal if i can use a native one.

Start by locating the Java native ApiClient class and the existing setHttpClientBuilder entry point. Add the requested direct HttpClient construction path and verify that native Java clients can use the supplied client without relying on a builder.