Customer-Groups: workflow hooks / emit events

[JohnGemstone]

Hey all I've come to a dead end where I cant send a notification to a customer when they've been added to a customer-group.
Could we add some workflow hooks or add an emit step?

https://github.com/medusajs/medusa/blob/develop/packages/core/utils/src/core-flows/events.ts
https://github.com/medusajs/medusa/blob/develop/packages/core/core-flows/src/customer-group/workflows/link-customer-groups-customer.ts

Maybe we could have a generic hook added to all workflows which returns whatever is in workflow's response?
e.g. linkCustomerGroupsToCustomerWorkflow.hooks.completed

Cheers!