add event search

Fixes #77

lib/models/paginate_manual.dart

@@ -8,7 +8,7 @@ part "paginate_manual.g.dart";
 @Freezed(toJson: false, fromJson: false)
 @JsonSerializable()
 class const PaginateManual({
-  required final IList<Event> events,
+  final IList<Event> events = const .empty(),
   final IList<Event> relatedEvents = const .empty(),
   required final String? nextBatch,
 }) with _$PaginateManual {

lib/models/requests/search.dart

@@ -0,0 +1,21 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+
+part "search.freezed.dart";
+part "search.g.dart";
+
+@Freezed(toJson: false, fromJson: false)
+@JsonSerializable(includeIfNull: false)
+class const SearchRequest({
+  required final String searchTerm,
+  final IList<String> roomIds = const .empty(),
+  final int limit = 20,
+  final bool sortByTime = true,
+
+  final String? nextBatch,
+}) with _$SearchRequest {
+  Map<String, Object?> toJson() => _$SearchRequestToJson(this);
+
+  factory SearchRequest.fromJson(Map<String, Object?> json) =>
+      _$SearchRequestFromJson(json);
+}

lib/models/room_metadata.dart

@@ -1,4 +1,5 @@
 import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/encryption.dart";
 import "package:nexus/models/epoch_date_time_converter.dart";
 import "package:nexus/models/lazy_load_summary.dart";
 
@@ -15,6 +16,8 @@ class const RoomMetadata({
   final String? topic,
   final String? canonicalAlias,
   final LazyLoadSummary? lazyLoadSummary,
+
+  final EncryptionContent? encryptionEvent,
   required final bool hasMemberList,
   @JsonKey(name: "preview_event_rowid") required final int previewEventRowID,
   @EpochDateTimeConverter() required final DateTime sortingTimestamp,