fix: EXPOSED-130 Logger throws ClassCastException with JSON and ListSerializer

[bog-walk]

When a JSON/JSONB column that takes a List or ListSerializer is created, it correctly deserializes/serializes the JSON array to and from the database. However, attempting to log any SQL statements with the collection as a String throws a ClassCastException.

If the column is created to take an Array or ArraySerializer instead, then no exception is thrown when the logger is used.

This happens because lists are processed by ColumnType.valueToString() as ArrayList, which extends the Iterable superclass and is handled separately:

fun valueToString(value: Any?): String = when (value) {
    null -> {
        check(nullable) { "NULL in non-nullable column" }
        "NULL"
    }
    DefaultValueMarker -> "DEFAULT"
    is Iterable<*> -> value.joinToString(",", transform = ::valueToString)
    else -> nonNullValueToString(value)
}

Whereas arrays are processed as Array (or another type-specific class), which does not extend Iterable, so the else branch is reached.

This function now has an override in JsonColumnType.