Add release notes collect script (#14879)

Author: pakrym

eng/scripts/Collect-Changelogs.ps1

@@ -0,0 +1,45 @@
+[CmdletBinding()]
+param(
+  [Parameter(Mandatory=$true)]
+  [ValidateRange(1, 12)]
+  [int] $Month
+)
+
+$repoRoot = Resolve-Path "$PSScriptRoot/../..";
+. ${repoRoot}\eng\common\scripts\SemVer.ps1
+. ${repoRoot}\eng\common\scripts\ChangeLog-Operations.ps1
+$InstallNotes = "";
+$ReleaseNotes = "";
+
+$date = Get-Date -Month $month -Format "yyyy-MM"
+$date += "-\d\d"
+
+Get-ChildItem "$repoRoot/sdk" -Filter CHANGELOG.md -Recurse | Sort-Object -Property Name | % {
+    
+    $changeLogEntries = Get-ChangeLogEntries -ChangeLogLocation $_ 
+    $package = $_.Directory.Name
+    $serviceDirectory = $_.Directory.Parent.Name
+
+    foreach ($changeLogEntry in $changeLogEntries.Values)
+    {
+        if ($changeLogEntry.ReleaseStatus -notmatch $date)
+        {
+            
+            continue;
+        }
+
+        $version = $changeLogEntry.ReleaseVersion
+        $githubAnchor = $changeLogEntry.ReleaseTitle.Replace("## ", "").Replace(".", "").Replace("(", "").Replace(")", "").Replace(" ", "-")
+
+        $InstallNotes += "$> dotnet add package $package --version $version`n";
+        $ReleaseNotes += "### $package [Changelog](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/$serviceDirectory/$package/CHANGELOG.md#$githubAnchor)`n"
+        $changeLogEntry.ReleaseContent | %{ 
+
+            $ReleaseNotes += $_.Replace("###", "####")
+            $ReleaseNotes += "`n"            
+        }
+        $ReleaseNotes += "`n"
+    }
+}
+
+return $InstallNotes, $ReleaseNotes