New function: fetch datastream metadata

public/js/appChart.js

@@ -138,6 +138,19 @@ export const axiosGetRequest = function (urlObservations, urlParamObj) {
   });
 };
 
+const getDatastreamMetadata = async function (urlDatastream) {
+  try {
+    // Extract properties of interest
+    const {
+      data: { description, name, unitOfMeasurement },
+    } = await axiosGetRequest(urlDatastream);
+
+    return { description, name, unitOfMeasurement };
+  } catch (err) {
+    console.log(err);
+  }
+};
+
 /**
  * Format the response from SensorThings API to make it suitable for heatmap
  * @param {Array} obsArray Response from SensorThings API as array