New field in box.status system event, dd_version

[TarantoolBot]

Since: Tarantool 3.3.0
Root: https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_events/system_events/#system-events

dd_version: string, shows the version of schema database from
box.space.schema['version']. Not to be confused with box.schema.version.
Requested by @Serpentian in tarantool/tarantool@dde4602.