Rework startup topic handling and reenable output to logging framework (#14243)

Jellyfin.Server/ServerSetupApp/IStartupLogger.cs

@@ -1,5 +1,4 @@
 using System;
-using Morestachio.Helper.Logging;
 using ILogger = Microsoft.Extensions.Logging.ILogger;
 
 namespace Jellyfin.Server.ServerSetupApp;
@@ -9,6 +8,11 @@ namespace Jellyfin.Server.ServerSetupApp;
 /// </summary>
 public interface IStartupLogger : ILogger
 {
+    /// <summary>
+    /// Gets the topic this logger is assigned to.
+    /// </summary>
+    StartupLogTopic? Topic { get; }
+
     /// <summary>
     /// Adds another logger instance to this logger for combined logging.
     /// </summary>
@@ -22,4 +26,41 @@ public interface IStartupLogger : ILogger
     /// <param name="logEntry">Defines the log message that introduces the new group.</param>
     /// <returns>A new logger that can write to the group.</returns>
     IStartupLogger BeginGroup(FormattableString logEntry);
+
+    /// <summary>
+    /// Adds another logger instance to this logger for combined logging.
+    /// </summary>
+    /// <param name="logger">Other logger to rely messages to.</param>
+    /// <returns>A combined logger.</returns>
+    /// <typeparam name="TCategory">The logger cateogry.</typeparam>
+    IStartupLogger<TCategory> With<TCategory>(ILogger logger);
+
+    /// <summary>
+    /// Opens a new Group logger within the parent logger.
+    /// </summary>
+    /// <param name="logEntry">Defines the log message that introduces the new group.</param>
+    /// <returns>A new logger that can write to the group.</returns>
+    /// <typeparam name="TCategory">The logger cateogry.</typeparam>
+    IStartupLogger<TCategory> BeginGroup<TCategory>(FormattableString logEntry);
+}
+
+/// <summary>
+/// Defines a logger that can be injected via DI to get a startup logger initialised with an logger framework connected <see cref="ILogger"/>.
+/// </summary>
+/// <typeparam name="TCategory">The logger cateogry.</typeparam>
+public interface IStartupLogger<TCategory> : IStartupLogger
+{
+    /// <summary>
+    /// Adds another logger instance to this logger for combined logging.
+    /// </summary>
+    /// <param name="logger">Other logger to rely messages to.</param>
+    /// <returns>A combined logger.</returns>
+    new IStartupLogger<TCategory> With(ILogger logger);
+
+    /// <summary>
+    /// Opens a new Group logger within the parent logger.
+    /// </summary>
+    /// <param name="logEntry">Defines the log message that introduces the new group.</param>
+    /// <returns>A new logger that can write to the group.</returns>
+    new IStartupLogger<TCategory> BeginGroup(FormattableString logEntry);
 }