Related issues:

• Migrate Azure Service Principals that access storage to UC Storage Credentials #339
• [FEATURE]: Migrate AWS IAM Instance Profiles to UC Storage Credentials #862
• Report AWS Instance Profile to UC Storage Credentials (via query) #338

Jobs to be done:

• use ExternalLocations from https://github.com/databrickslabs/ucx/blob/main/src/databricks/labs/ucx/hive_metastore/locations.py and tables.TablesCrawler to verify if we have matching external locations configured already - use ws.external_locations.list() API for this.
• validate the logic of ExternalLocations for correctness and corner-cases
• create databricks labs ucx validate-external-locations command to display a number of tables per external location and any HMS table locations that don't belong to an existing external location
• print Terraform resource definitions to have those external locations setup