refactor: move Logging to GSS2.Core

GSS2.Core/Logging/FileLoggerProvider.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+
+namespace GSS2.Core.Logging;
+
+public sealed class FileLoggerProvider : ILoggerProvider
+{
+    private readonly string _filePath;
+
+    public FileLoggerProvider(string filePath, bool append = true)
+    {
+        _filePath = filePath;
+        if (!append && File.Exists(filePath))
+            File.Create(filePath);
+    }
+
+    public ILogger CreateLogger(string categoryName) => new FileLogger(categoryName, _filePath);
+
+    public void Dispose() { }
+}