Add changelog collection

eng/common/scripts/Collect-ChangeLogs.ps1

@@ -0,0 +1,60 @@
+[CmdletBinding()]
+param(
+  [Parameter(Mandatory=$true)]
+  [DateTime] $FromDate
+)
+
+. (Join-Path $PSScriptRoot common.ps1)
+
+$releaseHighlights = @{}
+
+if ($FromDate -as [DateTime])
+{
+    $date = ([DateTime]$FromDate).ToString($CHANGELOG_DATE_FORMAT)
+}
+else {
+    LogWarning "Invalid date passed. Switch to using the current date"
+    $date = Get-Date -Format $CHANGELOG_DATE_FORMAT
+}
+
+$allPackageProps = Get-AllPkgProperties
+
+foreach ($packageProp in $allPackageProps) {
+    $changeLogLocation = $packageProp.ChangeLogPath
+    if (!(Test-Path $changeLogLocation))
+    {
+        continue
+    }
+    $changeLogEntries = Get-ChangeLogEntries -ChangeLogLocation $changeLogLocation
+    $packageName = $packageProp.Name
+    $serviceDirectory = $packageProp.ServiceDirectory
+
+    foreach ($changeLogEntry in $changeLogEntries.Values) {
+        if ([System.String]::IsNullOrEmpty($changeLogEntry.ReleaseStatus))
+        {
+            continue;
+        }
+        $ReleaseStatus = $changeLogEntry.ReleaseStatus.Trim("(",")")
+        if (!($ReleaseStatus -as [DateTime]) -or $ReleaseStatus -lt $date)
+        {
+            continue;
+        }
+
+        $releaseVersion = $changeLogEntry.ReleaseVersion
+        $githubAnchor = $changeLogEntry.ReleaseTitle.Replace("## ", "").Replace(".", "").Replace("(", "").Replace(")", "").Replace(" ", "-")
+
+        $releaseTag = "${packageName}_${releaseVersion}"
+        $key = "${packageName}:${releaseVersion}"
+
+        $releaseHighlights[$key] = @{}
+        $releaseHighlights[$key]["PackageProperties"] = $packageProp
+        $releaseHighlights[$key]["ChangelogUrl"] = "https://github.com/Azure/azure-sdk-for-${LanguageShort}/blob/${releaseTag}/sdk/${serviceDirectory}/${packageName}/CHANGELOG.md#${githubAnchor}"
+        $releaseHighlights[$key]["Content"] = @()
+
+        $changeLogEntry.ReleaseContent | %{
+            $releaseHighlights[$key]["Content"] += $_.Replace("###", "####")
+        }
+    }
+}
+
+return $releaseHighlights