Command line options for service

[frankhorv]

The service must be able to run even without any argument provided at the command line (the default behavior).
The CLI part of the service needs to be implemented in a separate folder and appropriate modules...please see the snmp-sim-cli implementation for inspiration.
The main.rs should be extended by one function call to parse and handle the arguments, and that function should return a result to tell whether to run the default service functionality.-

• All config will be in YAML file, so maybe all we need on the is a “help” message that tells the user about the YAML file (i.e. where it lives)
• Option to generate a default config file =>
  • generate the base.yaml and write it to the destination folder (mandatory parameter)
  • don't overwrite the base.yaml by default => abort with error, if the file exists
  • add y argument to overwrite the base.yaml, if exists
• Man page generation using clap_mangen