Custom DSL Support for Webflux Security

[matthew-js-porter]

Expected Behavior

The Servlet HttpSecurity builder supports defining a custom DSL that can be applied with the
with method.

Example:

@Configuration
@EnableWebSecurity
public class Config {
	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		http
			.with(MyCustomDsl.customDsl(), (dsl) -> dsl
				.flag(true)
			)
			// ...
		return http.build();
	}
}

It would be nice if the same could be achieved with Webflux Security and ServerHttpSecurity.

Current Behavior

Currently ServerHttpSecurity does not provide this functionality.