Deny ApplyCharTypePadding from applying on specific In expressions

`ApplyCharTypePadding` rule shouldn't be applied to `In` expressions where elements of the `In.list` are not `StringType`s and in this task we fix it. This will lead to throwing the `DATATYPE_MISMATCH.DATA_DIFF_TYPES` instead of an internal one (`java.lang.ClassCastException`).