[feature] #2373: kagami swarm file and kagami swarm dir

[0x009922]

Description

#3475 introduces kagami swarm command, but it works only in directory mode. Now it is possible to produce both a "battery-included" directory and just a single file. The latter usage is especially helpful to generate sample docker-compose configurations to store them in the repo (docker-compose.yml, docker-compose.single.yml etc):

# only `docker-compose.yml`
kagami swarm file ./docker-compose.yml --build . --config-dir ./configs/peer --p 4 --seed "Kagami"

# a whole directory `test-swarm`
kagami swarm dir ./test-swarm --build . -p 4 --seed "Kagami"

Linked issue

Closes #2373

Benefits

We can automatise Docker Compose configurations generation and avoid problems with having outdated files in the repo. It will help the community.

Checklist

• Remove --outfile and --outdir options, use positionals instead
• Create an issue to include compose files generation into CI
  • [ci] Use kagami swarm in CI #3648
• Self-review

[appetrosyan]

I don't think this PR has the right target. We should merge into iroha2-dev most of the time,

[0x009922]

I don't think this PR has the right target. We should merge into iroha2-dev most of the time,

ATM of the PR creation, it was a direct successor of 2373-swarm branch, so I though it doesn't make sense to specify iroha2-dev as a target. Now with that PR being merged, the target has changed automatically.