Added several new cmdlet functions

Export-ModuleMember -Function Eradicate-PfaVolume
Export-ModuleMember -Function Get-PfaPorts
Export-ModuleMember -Function Get-PfaInitiators
Export-ModuleMember -Function Get-PfaHostGroupSpace
Export-ModuleMember -Function Get-PfaHostGroup
Export-ModuleMember -Function Open-PureStorageGitHub
Export-ModuleMember -Function Connect-PfaHostGroup
Export-ModuleMember -Function Connect-PfaProtectionGroups
Export-ModuleMember -Function Refresh-PfaVolume