sql: make IN operator stop ignoring type and collation

SQLite discards type and collation of IN operator when it comes with
only one operand. This leads to different results of straight comparison
using '=' operator and IN:

SELECT x FROM t1 WHERE x IN (1.0);
-- Result is empty set
SELECT x FROM t1 WHERE x = 1.0;
- - ['1']

Lets remove this strange ignorance and always take into consideration
types and collations of operands.

Closes #3934