Add CI/CD provider-specific loggers for GitHub Actions, Azure DevOps, and GitLab

src/Build/Logging/CICDLogger/AzureDevOps/AzureDevOpsForwardingLogger.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Build.Framework;
+
+#nullable enable
+
+namespace Microsoft.Build.Logging.CICDLogger.AzureDevOps;
+
+/// <summary>
+/// Forwarding logger for Azure DevOps that filters and forwards events from build nodes to the central logger.
+/// </summary>
+public sealed class AzureDevOpsForwardingLogger : IForwardingLogger
+{
+    /// <inheritdoc/>
+    public IEventRedirector? BuildEventRedirector { get; set; }
+
+    /// <inheritdoc/>
+    public int NodeId { get; set; }
+
+    /// <inheritdoc/>
+    public LoggerVerbosity Verbosity { get; set; } = LoggerVerbosity.Normal;
+
+    /// <inheritdoc/>
+    public string? Parameters { get; set; }
+
+    /// <inheritdoc/>
+    public void Initialize(IEventSource eventSource, int nodeCount)
+    {
+        NodeId = nodeCount;
+        Initialize(eventSource);
+    }
+
+    /// <inheritdoc/>
+    public void Initialize(IEventSource eventSource)
+    {
+        // Forward all errors and warnings unconditionally
+        eventSource.ErrorRaised += ForwardEvent;
+        eventSource.WarningRaised += ForwardEvent;
+
+        // Forward build lifecycle events
+        eventSource.BuildStarted += ForwardEvent;
+        eventSource.BuildFinished += ForwardEvent;
+        eventSource.ProjectStarted += ForwardEvent;
+        eventSource.ProjectFinished += ForwardEvent;
+
+        // Forward messages based on importance and verbosity
+        eventSource.MessageRaised += MessageRaised;
+    }
+
+    /// <inheritdoc/>
+    public void Shutdown()
+    {
+    }
+
+    private void ForwardEvent(object sender, BuildEventArgs e)
+    {
+        BuildEventRedirector?.ForwardEvent(e);
+    }
+
+    private void MessageRaised(object sender, BuildMessageEventArgs e)
+    {
+        // Forward messages based on verbosity
+        if (Verbosity == LoggerVerbosity.Quiet)
+        {
+            return;
+        }
+
+        if (e.Importance == MessageImportance.High ||
+            (e.Importance == MessageImportance.Normal && Verbosity >= LoggerVerbosity.Normal) ||
+            (e.Importance == MessageImportance.Low && Verbosity >= LoggerVerbosity.Detailed))
+        {
+            BuildEventRedirector?.ForwardEvent(e);
+        }
+    }
+}