Nima WebClient Builder Config support follow up

[arjav-desai]

In V3, following is set on builder from config, https://github.com/helidon-io/helidon/blob/helidon-3.x/webclient/webclient/src/main/java/io/helidon/webclient/WebClientConfiguration.java#L700,

            config.get("uri").asString().ifPresent(baseUri -> uri(URI.create(baseUri)));
            config.get("connect-timeout-millis").asLong().ifPresent(timeout -> connectTimeout(Duration.ofMillis(timeout)));
            config.get("read-timeout-millis").asLong().ifPresent(timeout -> readTimeout(Duration.ofMillis(timeout)));
            config.get("follow-redirects").asBoolean().ifPresent(this::followRedirects);
            config.get("max-redirects").asInt().ifPresent(this::maxRedirects);
            config.get("user-agent").asString().ifPresent(this::userAgent);
            config.get("keep-alive").asBoolean().ifPresent(this::keepAlive);
            config.get("cookies").asNode().ifPresent(this::cookies);
            config.get("headers").asNode().ifPresent(this::headers);
            DeprecatedConfig.get(config, "tls", "ssl")
                    .as(WebClientTls.builder()::config)
                    .map(WebClientTls.Builder::build)
                    .ifPresent(this::tls);
            config.get("proxy")
                    .as(Proxy.builder()::config)
                    .map(Proxy.Builder::build)
                    .ifPresent(this::proxy);
            config.get("media-support").as(MediaContext::create).ifPresent(this::mediaContext);
            config.get("relative-uris").asBoolean().ifPresent(this::relativeUris);
            config.get("dns-resolver-type").asString()
                    .map(s -> DnsResolverType.valueOf(s.toUpperCase()))
                    .ifPresent(this::dnsResolverType);

In V4, we are adding some of this with Issue #6935 and PR #7056. However, following is not yet available to set and should be added when ready.

config.get("cookies").asNode().ifPresent(this::cookies);
config.get("proxy")
		.as(Proxy.builder()::config)
		.map(Proxy.Builder::build)
		.ifPresent(this::proxy);
config.get("media-support").as(MediaContext::create).ifPresent(this::mediaContext);
config.get("relative-uris").asBoolean().ifPresent(this::relativeUris);
config.get("dns-resolver-type").asString()
		.map(s -> DnsResolverType.valueOf(s.toUpperCase()))
		.ifPresent(this::dnsResolverType);