feat: add auth commands

[HatiCode]

📑 Description

Initiated a change on the auth command the follow the style of "filter"
This allows for now to:

• list the configured providers
• Add a new provider configuration

Still needed (If PR is accepted an issue for this will be created):

• possibility to update a previously configured provider

Older Flags are now defined in the "new" command.
Creating a provider would look like:

k8sgpt auth new -b -m -p -u

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

[AlexsJones]

It feels quite nice to separate these out, I would ask you update the documentation in the README and the docs page though

[AlexsJones]

Please update the README