Properly make JaxRsHttpClient with Quarkus SNAPSHOT

Follows up on: #1385

Author: geoand

model-providers/jaxrs-client/src/main/java/io/quarkiverse/langchain4j/jaxrsclient/JaxRsHttpClient.java

@@ -88,7 +88,7 @@ public boolean isTrustAll() {
 
                 // TODO: when we bump to the next LTS, this needs to be implemented properly
                 //for the time being it exists only to make the module compile against the SNAPSHOT version of Quarkus
-                public String getName() {
+                public Optional<String> getName() {
                     throw new IllegalStateException("this should not be called");
                 }
             });