Add Main property to SentryThread

Added an optional flag to indicate whether the thread was responsible for
rendering the user interface. On mobile platforms this is oftentimes
referred to as the "main thread" or "ui thread".

Author: bitsandfoxes

src/Sentry/SentryThread.cs

@@ -29,6 +29,13 @@ public sealed class SentryThread : ISentryJsonSerializable
     /// </summary>
     public bool? Current { get; set; }
 
+    /// <summary>
+    /// An optional flag to indicate whether the thread was responsible for rendering
+    /// the user interface. On mobile platforms this is oftentimes referred to as the
+    /// "main thread" or "ui thread".
+    /// </summary>
+    public bool? Main { get; set; }
+
     /// <summary>
     /// Stack trace.
     /// </summary>
@@ -44,6 +51,7 @@ public void WriteTo(Utf8JsonWriter writer, IDiagnosticLogger? logger)
         writer.WriteStringIfNotWhiteSpace("name", Name);
         writer.WriteBooleanIfNotNull("crashed", Crashed);
         writer.WriteBooleanIfNotNull("current", Current);
+        writer.WriteBooleanIfNotNull("main", Main);
         writer.WriteSerializableIfNotNull("stacktrace", Stacktrace, logger);
 
         writer.WriteEndObject();
@@ -58,6 +66,7 @@ public static SentryThread FromJson(JsonElement json)
         var name = json.GetPropertyOrNull("name")?.GetString();
         var crashed = json.GetPropertyOrNull("crashed")?.GetBoolean();
         var current = json.GetPropertyOrNull("current")?.GetBoolean();
+        var main = json.GetPropertyOrNull("main")?.GetBoolean();
         var stacktrace = json.GetPropertyOrNull("stacktrace")?.Pipe(SentryStackTrace.FromJson);
 
         return new SentryThread
@@ -66,6 +75,7 @@ public static SentryThread FromJson(JsonElement json)
             Name = name,
             Crashed = crashed,
             Current = current,
+            Main = main,
             Stacktrace = stacktrace
         };
     }