Extend range of printable unicode characters

Before the patch unicode characters encoded with 4 bytes
were always treated as non-printable and displayed as byte
sequences (with 'binary' tag).
With the patch, range of printable characters is extended and
include characters encoded with 4 bytes.
Currently it is: (old printable range) U (icu printable range).
Corresponding changes are also made in tarantool/libyaml.

Closes: #4090