Add logging for dynamic nodes

move-money-dynamic/wit/dynamic_node.wit

@@ -39,5 +39,8 @@ interface types {
 // This will apply to csv files only for simplicity. A separate node should be created for arbitrary readers/writers
 world dynamic {
     use types.{csv-readers, read-map, csv-writer};
+    import log: func(message: string);
+    import log-error: func(error-message: string);
+
     export evaluate: func(properties: read-map, readers: csv-readers, writer: csv-writer);
 }

src/graph/dynamic/dynamic_state.rs

@@ -28,4 +28,13 @@ impl DynamicState {
     }
 }
 
+impl DynamicImports for DynamicState {
+    fn log(&mut self, message: String) {
+        println!("{}", message);
+    }
+    fn log_error(&mut self, message: String) {
+        eprintln!("{}", message);
+    }
+}
+
 impl Host for DynamicState {}

wit/dynamic_node.wit

@@ -39,5 +39,8 @@ interface types {
 // This will apply to csv files only for simplicity. A separate node should be created for arbitrary readers/writers
 world dynamic {
     use types.{csv-readers, read-map, csv-writer};
+    import log: func(message: string);
+    import log-error: func(error-message: string);
+
     export evaluate: func(properties: read-map, readers: csv-readers, writer: csv-writer);
 }