add powershell user management with argon2 password hashing

[awakecoding]

Add PowerShell user management cmdlets with argon2 password hashing. Here's my set of commands to bootstrap a localhost HTTP configuration with user "admin" and password "yolo123!" for local development:

$ConfigPath = Join-Path (Get-Location) 'config'
$Env:DGATEWAY_CONFIG_PATH="$ConfigPath"
$WebAppPath = Join-Path (Get-Location) 'webapp'
$Env:DGATEWAY_WEBAPP_PATH="$ConfigPath"
New-Item $ConfigPath -ItemType Directory -ErrorAction SilentlyContinue

.\powershell\build.ps1
pwsh.exe
Import-Module .\powershell\DevolutionsGateway
$Hostname = "localhost"
$Username = "admin"
$Password = "yolo123!"
$HttpListener = New-DGatewayListener 'http://*:7171' 'http://*:7171'
$WebApp = New-DGatewayWebAppConfig -Enabled $true -Authentication Custom
$ConfigParams = @{
  Hostname = $Hostname
  Listeners = @($HttpListener)
  WebApp = $WebApp
}
Set-DGatewayConfig @ConfigParams
New-DGatewayProvisionerKeyPair -Force
Set-DGatewayUser -Username $Username -Password $Password
exit

cd ./webapp/web && npm install && ng build && cd ../..

cargo run

[thenextman]

I've tested it on my branch and it works well 👍