revert breaking change

[sdelamo]

Several breaking changes were introduced accidentally in #1526

if a user had a bean extending AuthenticationProvider they will get:

java/example/micronaut/AuthenticationProviderUserPassword.java:29: error: wrong number of type arguments; required 3
public class AuthenticationProviderUserPassword implements AuthenticationProvider<HttpRequest<?>>  { // <2>
                                                                                 ^

This PR reverts the changes to Authenticator and AuthenticationProvider so that users are able to upgrade their applications and see only a deprecation notice.

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
91.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud