fix(anta.cli)!: Avoid requiring username, password, inventory for the get commands

[gmuloc]

Description

we have 2 ways of solving the problem:

1. Moving the required arguments to the groups where they are actually needed (but then we change the CLI and where the parameters have to be put so breaking change ++)
2. Doing the stuff I am doing in this PR -> replace the required with some custom Group / callbacks to relax the requirement depending on the command being called. It turns out to be more cumbersome as we need to inject the CLI arguments in the context to pass to the callback. An alternative is to write all the logic in the custom Group class which may allow us to keep the required=True on username and inventory (and so, see it in the help, though in the help well having required on some options that is ONLY SOMETIMES required option is meeeeh)

Fixes #355, #479 (duplicate)

Decision taken is to move the CLI option NOW before we release v1.0.0 to not live with our previous decisions.
This turned this PR in some heavy but very welcomed refactoring from @mtache

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)

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[gmuloc]

https://stackoverflow.com/questions/50061342/is-it-possible-to-reuse-python-click-option-decorators-for-multiple-commands

lets break stuff

[gmuloc]