Support streaming in SqlTemplate

### Describe the feature

It would be nice if SqlTemplate exposed something like executeStream(int size, Map params) method that would provide ability to use row streaming (on supported clients). Otherwise user needs to result to using raw client, which is viable but if you are using SqlTemplate and for streaming you need to switch directly to use the client it can be a bit clunky.

### Contribution

I would be willing to take a look at this