feature: analyzer for Nodes

[botchk]

Checklist:

• I've searched for similar issues and couldn't find anything matching
• I've discussed this feature in the #k8sgpt slack channel

Is this feature request related to a problem?

• Yes
• No

Describe the solution you'd like

It would be helpful to also look at nodes for potential problems. Node conditions are a good indicator that something is wrong and can point to the root cause of why certain workloads are not being scheduled.

I would suggest this analyzer as core, enabled by default.

Benefits for the project and its users

Users can detect and troubleshoot problems of their nodes

[botchk]

Feel free to assign this issue to me 😄

[AlexsJones]

How are you getting on with this @yeahservice ?

[botchk]

@AlexsJones some busy past days for me but I am expecting to get a PR out by the end of this week.