Sync eng/common directory with azure-sdk-tools repository (#7393)

eng/common/Extract-ReleaseNotes.ps1

@@ -0,0 +1,47 @@
+# given a CHANGELOG.md file, extract the relevant info we need to decorate a release
+param (
+  [Parameter(Mandatory = $true)]
+  [String]$ChangeLogLocation
+)
+
+$RELEASE_TITLE_REGEX = "(?<releaseNoteTitle>^\#+.*(?<version>\b\d+\.\d+\.\d+([^0-9\s][^\s:]+)?))"
+
+$releaseNotes = @{}
+$contentArrays = @{}
+if ($ChangeLogLocation.Length -eq 0)
+{
+  return $releaseNotes
+}
+
+try 
+{
+  $contents = Get-Content $ChangeLogLocation
+
+  # walk the document, finding where the version specifiers are and creating lists
+  $version = ""
+  foreach($line in $contents){
+      if ($line -match $RELEASE_TITLE_REGEX)
+      {
+        $version = $matches["version"]
+        $contentArrays[$version] = @()
+      }
+
+      $contentArrays[$version] += $line
+  }
+
+  # resolve each of discovered version specifier string arrays into real content
+  foreach($key in $contentArrays.Keys)
+  {
+      $releaseNotes[$key] = New-Object PSObject -Property @{
+      ReleaseVersion = $key
+      ReleaseContent = $contentArrays[$key] -join [Environment]::NewLine
+      }
+  }
+}
+catch
+{
+  Write-Host "Error parsing $ChangeLogLocation."
+  Write-Host $_.Exception.Message
+}
+
+return $releaseNotes