Add flux stats command to print the reconcilers status

[stefanprodan]

$ flux stats -n A
RECONCILERS             RUNNING FAILING SUSPENDED       STORAGE   
GitRepository           2       0       0               105.1 MiB       
OCIRepository           6       1       0               55.8 KiB        
HelmRepository          6       0       0               249.5 KiB       
HelmChart               6       0       0               538.6 KiB       
Bucket                  1       0       1               37.3 KiB        
Kustomization           6       0       0               -               
HelmRelease             6       0       0               -               
Alert                   0       0       0               -               
Provider                0       0       0               -               
Receiver                1       1       0               -               
ImageUpdateAutomation   0       0       0               -               
ImagePolicy             0       0       0               -               
ImageRepository         0       0       0               - 

[hiddeco]

Still on the fence about this being called state vs stats, but given the idea from this came from docker stats I think I am fine with either.