feat: change delete icon to archive

[imGok]

This Closes #326

[hoangdat]

please also change the function from delete to archive also, Twake will not support delete

[imGok]

please also change the function from delete to archive also, Twake will not support delete

Current action is room.leave()

API call :

  /// This API stops a user participating in a particular room.
  ///
  /// If the user was already in the room, they will no longer be able to see
  /// new events in the room. If the room requires an invite to join, they
  /// will need to be re-invited before they can re-join.
  ///
  /// If the user was invited to the room, but had not joined, this call
  /// serves to reject the invite.
  ///
  /// The user will still be allowed to retrieve history from the room which
  /// they were previously allowed to see.
  ///
  /// [roomId] The room identifier to leave.
  ///
  /// [reason] Optional reason to be included as the `reason` on the subsequent
  /// membership event.
  Future<void> leaveRoom(String roomId, {String? reason}) async {
    final requestUri = Uri(
        path: '_matrix/client/v3/rooms/${Uri.encodeComponent(roomId)}/leave');
    final request = Request('POST', baseUri!.resolveUri(requestUri));
    request.headers['authorization'] = 'Bearer ${bearerToken!}';
    request.headers['content-type'] = 'application/json';
    request.bodyBytes = utf8.encode(jsonEncode({
      if (reason != null) 'reason': reason,
    }));
    final response = await httpClient.send(request);
    final responseBody = await response.stream.toBytes();
    if (response.statusCode != 200) unexpectedResponse(response, responseBody);
    final responseString = utf8.decode(responseBody);
    final json = jsonDecode(responseString);
    return ignore(json);
  }

and archived is just a room you left

  /// Is the room archived
  bool get isArchived => membership == Membership.leave;