Support edges for Query API's

The current API doesn't allow to traverse along the edges.

event.getGraphContext().getFramed().query(). event.getGraphContext().getQuery().type(ServerIdentModel.class).edges(ServerRecognizer.class)
Query.fromType(ServerIdentModel.class).withProperty(ServerIdentModel.RECOGNIZER, recognizerClass);
event.getGraphContext().getQuery().type(ServerIdentModel.class).edges(ServerRecognizer.class);
event.getGraphContext().getFramed().

When inside of an operation, it's quite hard to look in the graph along the edges. The fluent API only allows filtering by properties (has()). It would be greatly useful to have equivalents of at least .inV(...) and .outV(...).