add cr pro message (#440)

<!-- This is an auto-generated comment: release notes by OSS CodeRabbit
-->
### Summary by CodeRabbit

## Release Notes

### New Feature
- Introduced CodeRabbit Pro, an advanced paid version of the project
with additional features and improvements compared to the open-source
version.

---

> 🎉 Celebrate, oh developers far and wide, 🌍
>
> For CodeRabbit Pro has arrived! 🐇💼
>
> With features new and improvements galore, 💡🚀
>
> Coding will never be a bore. 🎈🎊
>
> So let's embrace this change, my friend, 👫
>
> And code towards a future without end! 🌅💻
<!-- end of auto-generated comment: release notes by OSS CodeRabbit -->

Author: harjotgill

dist/index.js

@@ -457,6 +457,17 @@ ${RAW_SUMMARY_END_TAG}
 ${SHORT_SUMMARY_START_TAG}
 ${inputs.shortSummary}
 ${SHORT_SUMMARY_END_TAG}
+
+---
+
+<details>
+<summary>Uplevel your code reviews with CodeRabbit Pro</summary>
+
+### CodeRabbit Pro
+
+If you like this project, please support us by purchasing the [Pro version](https://coderabbit.ai). The Pro version has advanced context, superior noise reduction and several proprietary improvements compared to the open source version.
+
+</details>
 `
 
   statusMsg += `