Add node/executor about get edges/vertices. (#141)

* Add node/executor about get edges/vertices.

* Remove the node checking.

* Skip the invalid input vertices/edges.

* Remove the extra headers.

* Remove the unused header.

* Remove some unused code.

* Remove the unused header.

* Fix the eq logic.

* Using the var name as node label now.

* Correct the logic.

Co-authored-by: dutor <440396+dutor@users.noreply.github.com>