[Feat] Integrate Neo4j spark connector as input data source

[acezen]

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[yixinglu]

In addition, it's better to read neo4j data and generate GraphAR files by streaming, which can avoid loading all data into memory.

[lixueclaire]

solved by #107

[acezen]

In addition, it's better to read neo4j data and generate GraphAR files by streaming, which can avoid loading all data into memory.

Good suggestions. A issue #119 has been created for this.