feat(zendesk): add zendesk integration (#1385)

* feat(zendesk): add zendesk integration

* Add Zendesk connection documentation

* docs(zendesk/connection): add missing steps

* feat(zendesk): add more auth scopes for planned triggers/actions

* fix(zendesk): fix instanceUrl

---------

Co-authored-by: Ali BARIN <ali.barin53@gmail.com>

packages/backend/src/apps/zendesk/auth/generate-auth-url.ts

@@ -0,0 +1,23 @@
+import { IField, IGlobalVariable } from '@automatisch/types';
+import { URLSearchParams } from 'url';
+import authScope from '../common/auth-scope';
+
+export default async function generateAuthUrl($: IGlobalVariable) {
+  const oauthRedirectUrlField = $.app.auth.fields.find(
+    (field: IField) => field.key == 'oAuthRedirectUrl'
+  );
+
+  const redirectUri = oauthRedirectUrlField.value as string;
+  const searchParams = new URLSearchParams({
+    response_type: 'code',
+    redirect_uri: redirectUri,
+    client_id: $.auth.data.clientId as string,
+    scope: authScope.join(' '),
+  });
+
+  await $.auth.set({
+    url: `${
+      $.auth.data.instanceUrl
+    }/oauth/authorizations/new?${searchParams.toString()}`,
+  });
+}