feat(user): add a logs command in CLI

[qjerome]

Kunai stores last logs in plain text but compresses old archives. It can be a burden to read the logs in the proper order for inspection. So this PR adds a new command in the CLI to read the logs and print them out (in good order) in the terminal.

Example

Easy way to show Kunai logs. This will work only with a configuration file and with an output file being configured

Usage: kunai logs [OPTIONS]

Options:
  -c, --config <CONFIG>      Path to the configuration file [default: /etc/kunai/config.yaml]
  -l, --log-file <LOG_FILE>  Path to the log file to open. The path must point to the plain-text log file, not to one of the archives
  -h, --help                 Print help