- to_char(datetime, format), format is specified
as in `strftime` function:
https://man.freebsd.org/cgi/man.cgi?query=strftime&sektion=3

Co-authored-by: EmirVildanov <reddog201030@gmail.com>

- support parameters in form of $n like in postgres
- parameters are numbered from 1
- can't use both tarantool (?) and pg-like ($n) params
in one query