Add Java orchestrator to connect to the AI engine (#6003)

# Description of Changes
Add Java orchestration layer which can connect and go back and forth
with the AI engine to get results for the user. It's expected that the
AI engine will not be publicly available and this Java layer will always
be in front of it, to manage sessions and auth etc.

app/common/src/main/java/stirling/software/common/model/ApplicationProperties.java

@@ -75,6 +75,7 @@ public class ApplicationProperties {
     private AutoPipeline autoPipeline = new AutoPipeline();
     private ProcessExecutor processExecutor = new ProcessExecutor();
     private PdfEditor pdfEditor = new PdfEditor();
+    private AiEngine aiEngine = new AiEngine();
 
     @Bean
     public PropertySource<?> dynamicYamlPropertySource(ConfigurableEnvironment environment)
@@ -231,6 +232,13 @@ public class ApplicationProperties {
         }
     }
 
+    @Data
+    public static class AiEngine {
+        private boolean enabled = false;
+        private String url = "http://localhost:5001";
+        private int timeoutSeconds = 120;
+    }
+
     @Data
     public static class Legal {
         private String termsAndConditions;