tools: implement toolchain for crash artefacts

This patch introduces two scripts to ease crash artefacts collecting and
loading for postmortem analysis:

* tarabrt.sh - the tool collecting a tarball with the crash artefacts
  the right way: the coredump with the binary, all loaded shared libs,
  Tarantool version (this is a separate exercise to get it from the
  binary built with -O2). Besides, the tarball has a unified layout, so
  it can be easily processed with the second script:
  - /coredump - core dump file on the root level
  - /binary - tarantool executable on the root level
  - /version - plain text file on the root level with
    `tarantool --version` output
  - /checklist - plain text file on the root level with the list of the
    collected entities
  - /etc/os-release - the plain text file containing operating system
    identification data
  - all shared libraries used by the crashed instance - their layout
    respects the one on the host machine, so they can be easily loaded
    with the following gdb command: set sysroot $(realpath .)

  The script can be easily used either manually or via
  kernel.core_pattern variable.

* gdb.sh - the auxiliary script originally written by @Totktonada, but
  needed to be adjusted to the crash artefacts layout every time. Since
  there is a unified layout, the original script is enhanced a bit to
  automatically load the coredump via gdb the right way.

Closes #5569

Reviewed-by: Alexander Turenko <alexander.turenko@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>