Support automatic generation of hints from `WHERE` clauses

[j6k4m8]

Similar to #63 and #68, we could look at WHERE clauses and automatically subset the vertices that are valid structural matches and set these as hints. I think this would be faster than waiting for the postprocessing on the is_node_..._match function...

[khoale88]

Hi @j6k4m8 , do you have any plan how to implement this?

[khoale88]

should be resolved with this commit

6a7bd61