Gmail source improvements (#15820)

* Gmail source improvements

- Make the trigger_type prop optional with default to polling
- Make timer, labels, and exclude_labels props not hidden by default
- Improve handling of webhooks & client verification
- Add error handling and better UI flow for configuration
- Fix ConfigurationError issues with topic creation and service account validation

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <[email protected]>

* Update package.json

Author: dannyroosevelt

components/gmail/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pipedream/gmail",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Pipedream Gmail Components",
   "main": "gmail.app.mjs",
   "keywords": [