[BUG] Https protocol schema is not handled correctly in java 11 native code

Created by: thecrazzymouse

Description

The schema in the ApiClient is hard wired to http and there is no way to change this like the other parameters like host.

openapi-generator version

4.1.0

Suggest a fix

Add a setter method for schema:

public ApiClient setScheme(String scheme){ this.scheme = scheme; return this; }