4.x WebClient Security Digest Authentication

[romain-grecourt]

• Helidon Version: 4.0.0-ALPHA6

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We need an equivalent to org.glassfish.jersey.client.authentication.HttpAuthenticationFeature

This should support passing authentication directly to the client in form of properties.

client.get(uri)
    .property(HTTP_AUTHENTICATION_USERNAME, username)
    .property(HTTP_AUTHENTICATION_PASSWORD, password)
    .request();

[tomas-langer]

This is supported for BasicAuthentication and Jwt (both SE and MP). It cannot be supported for digest authentication, as we do not support outbound security with HTTP Digest.
I will refactor the constants used to have a single set on a shared place (currently duplicated in JwtAuthProvider and HttpBasicAuthProvider)