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

lib/models/requests/get_event.dart

@@ -0,0 +1,16 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+part "get_event.freezed.dart";
+part "get_event.g.dart";
+
+@Freezed()
+abstract class GetEventRequest with _$GetEventRequest {
+  const GetEventRequest._();
+  const factory GetEventRequest({
+    required String roomId,
+    required String eventId,
+    @Default(false) bool unredact,
+  }) = _GetEventRequest;
+
+  factory GetEventRequest.fromJson(Map<String, Object?> json) =>
+      _$GetEventRequestFromJson(json);
+}