Update pki-server to use ArgumentParser

[edewata]

The PKIServerCLI has been modified to create a main parser using ArgumentParser then create a subparser for each sub-command.

The CLI.create_parser() has been modified to take an optional subparsers object and pass it down to the modules.

The PKICLI, PasswordGenerateCLI, and PKCS12ImportCLI will be updated separately later.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[fmarco76]

LGTM

The changes are OK but IIUC the command will have the option from the main parser and the option from the subparser. Es.: pki-server -d start -d.
I think this is true also for the current implementation and in my experience with debug option it provide different results if it is before or after the command.
If this is intentional then the help should make more clear the difference. This can be discussed and addressed in future PRs.

[edewata]

@fmarco76 Thanks!

For pki-server --debug there's a slight difference. pki-server <command> --debug basically will enable debug for that command, whereas pki-server --debug <command> will enable debug for pki-server itself (which is not much) and the command too, so I think they can just be merged (i.e. it shouldn't matter where the option is specified).

For pki CLI right now there are some options that work differently depending on the location (e.g. pki --output <command> and pki <command> --output) so we might need to rename some options to avoid conflicts. We'll address that in the next PR.