Feature Request: Filter changes from Slack notifications

[jdolle]

The slack integration notifies us of safe, dangerous, and breaking changes. My team uses these notifications to passively monitor schema changes for security and schema design standard purposes.

One of those changes is the "description", which is not something that we are concerned with monitoring. My team would like more flexibility with the slack integration, to allow us to select which types of alerts to display, and to filter out certain changes such as the description.

This can be accomplished via a custom webhook, but there is a major benefit in how easy it was to integrate with Slack using what Hive provides, especially if going with the cloud hosted solution, so that we don't need to manage additional infrastructure for this webhook.

[pravintargaryen]

@n1ru4l assign this to me