Add migration from Neo4j (#557)

* Add migration from neo4j

* Update migration

* Add labels for migration from neo4j

* added PR test to merge_group (#571)

* Fix export encoding to UTF-8 (#554)

Co-authored-by: Ivan Milinović <[email protected]>

* Add constants for connection

* Refactor module

* Address PR comments

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Co-authored-by: Dr Matt James <[email protected]>
Co-authored-by: Ante Javor <[email protected]>
Co-authored-by: Ivan Milinović <[email protected]>

Author: 4 people