Added custom token support

EonaCat.Logger/Managers/LoggerSettings.cs

@@ -24,7 +24,7 @@ public class LoggerSettings
 
     private FileLoggerOptions _fileLoggerOptions;
 
-    private string _headerFormat = "{ts} {host} {category} {thread} {sev}";
+    private string _headerFormat = "{ts} {tz} {host} {category} {thread} {sev}";
     private string _timestampFormat = "yyyy-MM-dd HH:mm:ss";
 
     /// <summary>
@@ -32,8 +32,18 @@ public class LoggerSettings
     /// </summary>
     public bool UseLocalTime { get; set; }
 
+    /// <summary>
+    /// Gets or sets the unique identifier for the application instance.
+    /// </summary>
     public string Id { get; set; } = DllInfo.ApplicationName;
 
+    /// <summary>
+    /// Gets or sets the collection of custom header tokens to be included in outgoing requests.
+    /// </summary>
+    /// <remarks>Use this property to specify additional headers that should be sent with each request.
+    /// Modifying the collection affects all subsequent requests made by this instance.</remarks>
+    public HeaderTokens HeaderTokens { get; set; } = new HeaderTokens();
+
     /// <summary>
     ///     Header format.  Provide a string that specifies how the preamble of each message should be structured.  You can use
     ///     variables including:
@@ -42,7 +52,7 @@ public class LoggerSettings
     ///     {category}: Category
     ///     {thread}: Thread ID
     ///     {sev}: Severity
-    ///     Default: {ts} {host} {category} {thread} {sev}
+    ///     Default: {ts} {tz} {host} {category} {thread} {sev}
     ///     A space will be inserted between the header and the message.
     /// </summary>
     public string HeaderFormat