Optional naming of subcommands

[gmertes]

This PR allows subcommands to have a different name than their file name via an optional attribute command

Usage:

# commands/mycommand.py
class MyCommand(Command):
   command = "fancy-command"

Will then become anemoi-package fancy-command instead of anemoi-package mycommand

If the command attribute is not present in the class, the filename is used. I suggest we use that as the default, and only add a command if an explicit rename is required.

[FussyDuck]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.40%. Comparing base (90b82bc) to head (7fe4fb6).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #34   +/-   ##
========================================
  Coverage    89.40%   89.40%           
========================================
  Files            5        5           
  Lines          151      151           
========================================
  Hits           135      135           
  Misses          16       16           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[gmertes]

Following internal feedback, name was renamed to command.

[anaprietonem]

LGTM