Option to run server side code that triggers on events - beforeSave(), afterSave() etc

[danibjor]

It would be nice to be able to write server side code that get triggered on events in the API.

• beforeSave gives you the option to do server side validation, crop/scale images etc
• afterSave could trigger pushNotifications, update linked object with sum(childElements) for commentCount etc.
• beforeDelete / afterDelete could maybe do cleanup work

Inspired by this: https://parseplatform.github.io/docs/cloudcode/guide/#getting-started

[nawazdhandala]

Thanks! We've added that to our roadmap. :)