 tt CLI (2.9): `tt pack` packs TCM config, if any.

**Product:** tt CLI
**Since:** tt 2.10.0
**Dev ticket:** 
**Root document:** https://www.tarantool.io/en/doc/latest/reference/tooling/tt_cli/pack/

**SME:** @ AlexandrLitkevich @ oleg-jukovec 

# Details

Requested by @elhimov in https://github.com/tarantool/tt/commit/e7d1c7ef0bc4224da7986738b524422369277e6e.