Query catalog needs to support SQL scripts

[aeberhart]

When running a query, we currently support getting column metadata including primary and foreign key information. This requires the query to be parsed.

There can be situations, where the query runs on the DB, but cannot be parsed.

We need to support these cases and simply ignore the missing metadata.

[aeberhart]

The editor popup preview has an issue still.
We show the first results and allow chaning the query via the texteditor if the query contains an unsupported query.
If there's a parse exception, the screen stays blank

[aeberhart]

tracked in #210