Fix alerts not being usable externally

[Kushagra8888]

• Adds missing export statement for alerts in components.
• Adds babel plugin to support async keyword.
• Adds classes to alert wrappers to support customizing their styles.

[netlify[bot]]

Deploy preview for jolly-kirch-692fce ready!

Built with commit 0ca10cece344591067dd70a375a0b1b5b562584d

https://deploy-preview-104--jolly-kirch-692fce.netlify.com