PERF: Make ingestion for neo4j use CSV imports

[lumjjb]

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Currently importing is a bit slower than expected with direct queries. According to neo4j docs, CSV importing seems to provide better performance for ingesting our data. This issue is around taking a look, evaluating and implementing which technique should be used for GUAC.

https://neo4j.com/developer/guide-import-csv/ https://neo4j.com/blog/bulk-data-import-neo4j-3-0/

[lumjjb]

FYI: @mihaimaruseac

[pxp928]

@mihaimaruseac seems like this is irrelevant at this point. Close?

[mihaimaruseac]

Agree, we can close this.