mark SentryThreadMetadata internal

Author: lbloder

sentry/src/main/java/io/sentry/protocol/profiling/SentryThreadMetadata.java

@@ -10,9 +10,12 @@
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
+
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+@ApiStatus.Internal
 public final class SentryThreadMetadata implements JsonUnknown, JsonSerializable {
   private @Nullable String name;