Possible incorrect usage of supportMultipleResultSets database information.

Case:
```

fun AbstractQuery.lazySequence():Sequence<*>{
val resultSet= transaction.exec(it)
// transform resultSet into sequence
}
fun foo() = transaction{

MyBigTable.selectAll().lazySequence().forEach{
if(someCheck(it)){
MyOtherTable.update{
// someCode
}
}
}
}

```

But i have a closed result set exception. Closing result set happens at [Statement](https://github.com/JetBrains/Exposed/blob/fd63d487ea91c5ecaae9208d55c88d4b0b00094f/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/statements/Statement.kt#L57)

I'm not sure, but [javadoc](https://docs.oracle.com/javase/10/docs/api/java/sql/DatabaseMetaData.html#supportsMultipleResultSets() ) talks only about multiple resultSet in single execute statement, not about whole transaction.

May be exposed do not have to close all result sets when it execute another?