ClickHouse: Add function year() that returns current year

Use case

Similar logic as in now() and today() it returns current year.

Describe the solution you’d like

year() = year(now()) = year(today())

Currently year() fails: Code: 42. DB::Exception: Number of arguments for function toYear doesn't match: passed 0, should be 1 or 2: While processing toYear(). (NUMBER_OF_ARGUMENTS_DOESNT_MATCH) (version 22.13.1.294 (official build))