fix, java: leverage callTimeout instead of readTimeout for RequestOptions timeout configuration

[armandobelardo]

No description provided.

[dsinghvi]

This is probably what we want the generation to look like:

# core.ClientUtilities.java

public static final OkHttpUtilities {
  
  private OkHttpUtilities {
  }

  public static void withTimeout(RequestOptions requestOptions) {
    return Client.builder()...
  }
}

and then we can have it be consumed

if (requestOptions.timeout().isPresent()) {
  client = OkHttpClientUtilities.withTimeout(requestOptions);
}