PostgreSQL Data Query & Slack Notification via Webhook

## 👨‍🎤 Setup
1. Add Slack command and point it up to the webhook
2. Add the following to the **Set config** node
- `alerts_channel` with alerts channel to start threads on
- `instance_url` with this instance url to make it easy to debug
- `slack_token` with slack bot token to validate request
- `slack_secret_signature` with slack secret signature to validate request
- `help_docs_url` with help url to help users understand the commands 
3. Build other workflows to call and add them to `commands` in **Set Config**. Each command must be mapped to a workflow id with an `Execute Workflow Trigger` node
4. Activate workflow 🚀