treewide(refactor): rename files to follow the same style

lib/models/configs/reactions.dart

@@ -0,0 +1,14 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+part "reactions.freezed.dart";
+part "reactions.g.dart";
+
+@freezed
+abstract class ReactionsConfig with _$ReactionsConfig {
+  const factory ReactionsConfig({
+    required String roomId,
+    required int eventRowId,
+  }) = _ReactionsConfig;
+
+  factory ReactionsConfig.fromJson(Map<String, Object?> json) =>
+      _$ReactionsConfigFromJson(json);
+}