Add option to set preemptive authentication

The existing providers support preemptive authentication:
apache http client uses AuthCache (https://www.baeldung.com/httpclient-4-basic-authentication)
ahc has settings on the realm configuration (https://asynchttpclient.github.io/async-http-client/auth.html)
As far as I know, java 11 http client doesn't support preemptive authentication, so consider when to deal with this issue

Start by tracing the existing Apache HttpClient and AHC authentication configuration, then inspect the Java 11 HTTP client provider and its documented capabilities. Define the option's behavior and provider-specific acceptance criteria before implementing it; done means preemptive authentication can be configured consistently where supported.

Written by the indexing model from the issue text.