feat(product, types, modules-sdk): added event bus events for products (#4654)

what:

- adds an eventbus dependency to product module.
- emits events on product, category and collection CUD

RESOLVES CORE-1450

.eslintignore

@@ -20,6 +20,7 @@ packages/*
 !packages/cache-redis
 !packages/cache-inmemory
 !packages/create-medusa-app
+!packages/product
 
 
 **/models/*