Add support for UTF-16 encoded kubeconfig files #1654
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Motivation
Windows PowerShell uses the Unicode UTF-16LE encoding by default, which means that kubeconfig files may be encoded as UTF16 if they're being generated by Windows PS.
kubectl can parse UTF16 kubeconfig files, so I thought we could add this directly into kube-rs
Solution
This PR basically adds support for UTF-16LE, UTF-16BE, UTF-8 with BOM and UTF-8