Fetch all downstream entities & owners

Is your feature request related to a problem? Please describe.

“we are looking into leverage datahub's lineage for some backend processes/alerting

curious as to what the most efficient method is to fetch all downstream of entities of a given type, or upstream might be? Our use case is: Table X is experience ETL delays and we want to determine which charts/dashboards are impacted by this in Looker?I'm currently experimenting with the graphql endpoint but it seems like a lot of computation to do for each table” - Slack

“One of the things I wanted to understand, is how we could mirror Collibra's workflow functionality. For example, in Collibra it is possible to add a button to the UI which when clicked triggers custom Groovy code that for example gives the email addresses of all Owners that have a downstream asset (multiple levels deep) for a certain data asset. This way, upstream changes could be communicated to downstream data assets. How could we accomplish this with DataHub you think? I understand we just query the DataHub API, but how to add this button in the React UI?” - Slack

Describe the solution you'd like

GraphQL API & UI support to fetch all downstream entities