[FEATURE]: Allow passing in arbitrary strings into `pgMaterializedView().with()`

### Feature hasn't been suggested before.

- [X] I have verified this feature I'm about to request hasn't been suggested before.

### Describe the enhancement you want to request

I want to create materialized views in TimescaleDB (which uses Postgres under the hood).

```sql
CREATE MATERIALIZED VIEW stats_minute
WITH (
timescaledb.continuous -- This is the problem, I can't pass this into `pgMaterializedView().with()`
) AS
SELECT time_bucket('1 minute', time) AS bucket,
count(*) AS point_count,
FROM stats
GROUP BY bucket;
```

I haven't been able to figure out how to set this.

Docs for their `CREATE MATERIALIZED VIEW`: https://docs.timescale.com/api/latest/continuous-aggregates/create_materialized_view/