Allow EmptyList for prepared query parameters of type `List<?>`

[arkhipov]

Now if I try setting the value of a query parameter of the type List<?>, the server returns that EmptyList cannot be assigned to a parater of the type List<?>. It is annoying when you have a single prepared query which can get the empty list as its parameter.

For example

DECLARE $x AS List<uint32>;
DECLARE $y AS List<uint32>;

SELECT * FROM X WHERE x IN $x
UNION ALL
SELECT * FROM X WHERE y IN $y

[gridnevvvit]

@shnikd first, we need to implement the unit test to reproduce the issue and then we need a fix.