feat(ynab): add you need a budget app integration

packages/backend/src/apps/you-need-a-budget/auth/generate-auth-url.js

@@ -0,0 +1,22 @@
+import { URLSearchParams } from 'url';
+
+export default async function generateAuthUrl($) {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field) => field.key == 'oAuthRedirectUrl'
+  );
+  const redirectUri = oauthRedirectUrlField.value;
+  const state = Math.random().toString();
+  const searchParams = new URLSearchParams({
+    client_id: $.auth.data.clientId,
+    redirect_uri: redirectUri,
+    response_type: 'code',
+    state,
+  });
+
+  const url = `https://app.ynab.com/oauth/authorize?${searchParams.toString()}`;
+
+  await $.auth.set({
+    url,
+    originalState: state,
+  });
+}