[Improvement]install kbcli via krew

[nashtsai]

Add krew installation method for kbcli, reference kubevpn as example:

# reference from: https://github.com/kubenetworks/kubevpn?tab=readme-ov-file#install-from-krew-windows--macos--linux

kubectl krew index add kubevpn https://github.com/kubenetworks/kubevpn.git
kubectl krew install kubevpn/kubevpn 
kubectl kubevpn 

[github-actions]

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