fix: json linting not working on raw body + small ts corrections

packages/hoppscotch-app/helpers/functional/files.ts

@@ -0,0 +1,19 @@
+import * as TO from "fp-ts/TaskOption"
+
+export const readFileAsText = (file: File) =>
+  TO.tryCatch(
+    () =>
+      new Promise<string>((resolve, reject) => {
+        const reader = new FileReader()
+
+        reader.onload = () => {
+          resolve(reader.result as string)
+        }
+
+        reader.onerror = () => {
+          reject(new Error("File err"))
+        }
+
+        reader.readAsText(file)
+      })
+  )