Add chunked transfer demonstration and test framework

- Create Demo-ChunkedTransfer.ps1 for showcasing implementation
- Add PSMinIO-TestFunctions.psm1 with test functions
- Add Test-ChunkedModule.ps1 and Quick-Test.ps1 for validation
- Update Build.ps1 to output to Artifacts directory
- Remove unnecessary progress parameters (use standard ProgressAction)
- Add missing using statements for compilation
- Create test manifest PSMinIO-Test.psd1
- Ready for C# compilation and integration testing

Build.ps1

@@ -36,7 +36,7 @@ param(
     [ValidateSet('Debug', 'Release')]
     [string]$Configuration = 'Release',
     
-    [string]$OutputPath = 'Module\PSMinIO',
+    [string]$OutputPath = 'Artifacts\PSMinIO',
     
     [switch]$Clean,
     
@@ -221,7 +221,7 @@ try {
         Write-Status "Creating package..."
         
         $timestamp = Get-Date -Format 'yyyy.MM.dd.HHmm'
-        $packageDir = Join-Path 'Releases' $timestamp
+        $packageDir = Join-Path 'Artifacts' "Release-$timestamp"
         
         if (!(Test-Path $packageDir)) {
             New-Item -ItemType Directory -Path $packageDir -Force | Out-Null