Add `gds#find`

Based on feedback from @maxdemarzi, introduce a `gds#find` method that replaces `gds#findNodesByLabelAndProperty` and `ggo#getAllNodesWithLabel`.
`ResourceIterator<Node> find( Label label, Map<String, Object> properties );` ? Or a generalized predicate class. None of which conflict with this (you could consider it a specialization). Note that it's also what was there before, just with a shorter name.