[2pt] Configuration update, allow to disable sending crash information

[TarantoolBot]

Product: Tarantool
Since: 2.7.1
Audience/target:
Root document: https://www.tarantool.io/en/doc/latest/reference/configuration/#feedback
SME: @cyrillos
Peer reviewer: @

For a better analysis of program crashes the information associated with
the crash such as

• utsname (similar to uname -a output except the network name)
• build information
• reason for a crash
• call backtrace

is sent to the feedback server. To disable it set feedback_crashinfo
to false.
Requested by @cyrillos in tarantool/tarantool@f132aa9.

Definition of done

• new feedback_crashinfo config
• crash info data format

Related to #1749