Adding pypy notifications and optimizing workflow and parsers (#42)

get-new-tool-versions/parsers/verify-added-to-image/verify-xamarin-parser.psm1

@@ -0,0 +1,19 @@
+function Search-XamarinVersionsNotOnImage {
+    param (
+        [string]$ReleasesUrl,
+        [array]$FilterProducts
+    )
+
+    $xamarinReleases = (Invoke-RestMethod $ReleasesUrl).items
+    $filteredReleases = $xamarinReleases | Where-Object {$_.name -in $FilterProducts.name} | Sort-Object name | Select-Object name, version
+    $toolsetUrl = "https://raw.githubusercontent.com/actions/virtual-environments/main/images/macos/toolsets/toolset-11.json"
+    $uploadedReleases = (Invoke-RestMethod $toolsetUrl).xamarin
+    $releasesOnImage = @()
+    foreach ($FilterProduct in $FilterProducts) {
+        $releasesOnImage += @{$FilterProduct.name = $uploadedReleases.($FilterProduct.property)}
+    }
+    $versionsToAdd = $filteredReleases | Where-Object {$releasesOnImage.($_.name) -notcontains $_.version} | ForEach-Object {[string]::Empty} {
+        '{0,-15} : {1}' -f $_.name, $_.version
+    }
+    return $versionsToAdd
+}