reduce cpu, memory usage in CSI drivers on Windows

[andyzhangx]

Is your feature request related to a problem?/Why is this needed

powershell command would consume more memory and cpu on Windows, it's better replace with Golang API in Windows host process mode

1. (Get-Item -Path $Env:mount).Target
   replace with os.Readlink does not work: [WIP] fix: replace Get-Item powershell cmd with golang api #2265
2. there are other powershell commands in following code, it's better replacing them all with Golang APIs (search RunPowershellCmd)
   https://github.com/kubernetes-sigs/azuredisk-csi-driver/blob/master/pkg/os/disk/disk.go
   https://github.com/kubernetes-sigs/azuredisk-csi-driver/blob/master/pkg/os/volume/volume.go

Describe the solution you'd like in detail

Describe alternatives you've considered

Additional context