Fixes #2325: added property filters

[vga91]

Fixes #2325

Added nodePropFilter and relPropFilter,
with key the label / rel-type consistently with nodePropertyMappings and relPropertyMappings.

The values are the property keys to be filtered.

Resolve the linked issue together with the #2592

[JMHReif]

@vga91, looks like we have conflicts with the previous Config boolean (isCleanup) with the additions in this PR. We want both, correct?

<<<<<<< issue_2325_filter_props
        this.nodePropFilter = (Map<String, List<String>>) config.getOrDefault("nodePropFilter", Collections.emptyMap());
        this.relPropFilter = (Map<String, List<String>>) config.getOrDefault("relPropFilter", Collections.emptyMap());
=======
        this.cleanup = Util.toBoolean(config.get("cleanup"));
>>>>>>> 4.3

[vga91]

@vga91, looks like we have conflicts with the previous Config boolean (isCleanup) with the additions in this PR. We want both, correct?

<<<<<<< issue_2325_filter_props
        this.nodePropFilter = (Map<String, List<String>>) config.getOrDefault("nodePropFilter", Collections.emptyMap());
        this.relPropFilter = (Map<String, List<String>>) config.getOrDefault("relPropFilter", Collections.emptyMap());
=======
        this.cleanup = Util.toBoolean(config.get("cleanup"));
>>>>>>> 4.3

Exactly. I just rebased it with both of them.