feat: add support for displaying power status

[cjh1]

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Description

Add support for showing/listing the power status of components

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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[cjh1]

@synackd Would you mine reviewing this one, I seem to have lost my powers to add a reviewer ...

[synackd]

Thanks for the contribution! Can you provide testing instructions? My PCS environment is wonky, but I'd like to test if I can.

[synackd]

Can we put a PCS prefix on this variable? Since this is in the cmd package, this would be a variable global to all commands.

On that note, we probably need to refactor the commands to be in their own packages to avoid this issue subsequently...

[synackd]

Consequently, any package-level variables for PCS should have a prefix for now.

[cjh1]

Yes, I agree each command should have is own package. I moved the definition of the variables into their respective files, no real need to reuse the same variable and this makes usage more clear.

[synackd]

I see you've added the command prefix (e.g. transitionXnames) but could we also prepend pcs to distinguish that this is part of the pcs transition command? E.g. pcsTransitionXnames