Configuration status is shown in `box.info.config` now

[TarantoolBot]

Product: Tarantool
Since: 3.2
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_info/
SME: @ Totktonada

There is the config:info([version]) method, but in order to access it
over iproto an application developer should add something like the
following into the application code:

_G.config = require('config')

It is not convenient, at least because it requires an attention from the
application developer and it can't be solved solely by an administrator.

Now, the config:info('v2') result is reported in the config field of
the box.info table. It is accessible over iproto if appropriate
privileges are granted for a calling user.

Requested by @Totktonada in tarantool/tarantool@a1544d3 (tarantool/tarantool#10044, tarantool/tarantool#10051)