feat: create lib function to verify FCM token

src/libs/fcm/verifyFcmToken.ts

@@ -0,0 +1,26 @@
+import { sendFcmMessage } from "./sendFcmMessage";
+
+export async function verifyFcmToken(
+  token: string,
+  adminSdkJson: string,
+): Promise<boolean> {
+  return sendFcmMessage(
+    adminSdkJson,
+    { name: "token_verification", token },
+    true,
+  )
+    .then((response) => {
+      const error = "error" in response ? response.error : undefined;
+      if (error) {
+        console.error("Received error response while validating FCM token");
+        console.error(JSON.stringify(error));
+      }
+
+      return !error;
+    })
+    .catch((err) => {
+      console.error("Failed to verify FCM token", err);
+
+      return false;
+    });
+}