LEIs should be modeled as partOf a single GLEIS registry

[rivettp]

THE LEI should be part of the GLEIS since the names are allocated globally, and could move their administration between LOUs without changing. We have restriction on property isManagedBy to link the registry entry to the LOU.

Originally posted by @rivettp in https://github.com/_render_node/MDE3OlB1bGxSZXF1ZXN0UmV2aWV3MzU2OTIzNTU4/pull_request_reviews/more_threads