Provide support for implicit grant

[jgrandja]

Sample @EnableWebSecurity for Implicit Grant type.

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.authorizeRequests()
				.anyRequest().authenticated()
				.and()
			.apply(new ImplicitGrantConfigurer<>());
	}
}