refactor(dev-only): import tools (#2121)

packages/ui-services/src/Import/Utils.ts

@@ -0,0 +1,13 @@
+export const readFileAsText = (file: File): Promise<string> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader()
+    reader.onload = (e) => {
+      if (e.target?.result) {
+        resolve(e.target.result as string)
+      } else {
+        reject()
+      }
+    }
+    reader.readAsText(file)
+  })
+}