(chocolatey-community#58) Speed up Get-RemoteChecksum

The current Get_RemoteChecksum implementation uses Invoke-WebRequest
with progress bar which can be slow on larger files. This results in a
long checksumming process during automated packaging. By providing the
option to hide the progress bar, while losing the "interactive" download
update, we significantly increase the speed of the download.

src/Public/Get-RemoteChecksum.ps1

@@ -1,5 +1,5 @@
 # Author: Miodrag Milic <[email protected]>
-# Last Change: 22-May-2024.
+# Last Change: 3-June-2024.
 
 <#
 .SYNOPSIS
@@ -8,10 +8,19 @@
 #>
 function Get-RemoteChecksum( [string] $Url, $Algorithm='sha256', $Headers ) {
     $fn = [System.IO.Path]::GetTempFileName()
-    $wc = New-Object net.webclient
-    $wc.DownloadFile($Url, $fn)
-    $res = Get-FileHash $fn -Algorithm $Algorithm | ForEach-Object Hash
+
+	$originalShowProgress=$ProgressPreference
+	if (-not $showProgress)
+	{
+		$ProgressPreference = 'SilentlyContinue'
+	}
+	Invoke-WebRequest $Url -OutFile $fn -UseBasicParsing -Headers $Headers
+	if (-not $showProgress)
+	{
+		$ProgressPreference = $originalShowProgress
+	}
+
+	$res = Get-FileHash $fn -Algorithm $Algorithm | ForEach-Object Hash
     Remove-Item $fn -ea ignore
     return $res.ToLower()
-}
-
+}