[Feature]: Enhance Auth command

[HatiCode]

Checklist

• I've searched for similar issues and couldn't find anything matching
• I've discussed this feature request in the K8sGPT Slack and got positive feedback

Is this feature request related to a problem?

No

Problem Description

Auth could allow the user to update a previously configured provider. At the moment "auth" allows to list providers or add a new one.
Also, there's no background check on the validity of a configured key.

Solution Description

• add an update subcommand to the auth command
• Run a background check on the the key provided towards configured provider

Benefits

• Allow to modify a configured provider
• Make sure a provided key is valid if not generated through generate command

Potential Drawbacks

No response

Additional Information

No response

[HatiCode]

@AlexsJones Can I be assigned to this one ?

[AlexsJones]

Hey @HatiCode how are you getting on with this?

[HatiCode]

@AlexsJones I worked on this yesterday, I'll push a draft PR today but I'm facing a small issue right now I'm not able to apply a change to a single key and keep the rest as it is. That's because the flags apply the default value when writing config. Maybe you or @matthisholleville can help with this since I noticed you refactored some of the existing code already.