[core] Fallback for untyped null parameter, configured with connection property:

```java
import java.util.Properties;

Properties props = new Properties();
props.put("acolyte.parameter.untypedNull", "true"); // default: false

DriverManager.getConnection(jdbcUrl, props);
```
[scala] Connection properties support:

```scala
import acolyte.Acolyte.connection

connection(handler, "acolyte.parameter.untypedNull" -> "true"/* ... */)
```