Attributes in WITH...WHERE

Similarly to #331, `WHERE` clause might also refer to variables that are not retained by the projection.

E.g. the following should compile and resolve:

```
MATCH (p:Person)--(h:House)
WITH p
WHERE h.year > 2000
RETURN p
```

Currently, it leads to an exception:

```
ingraph.compiler.exceptions.NameResolutionException: Unresolvable name h.
```