message: Add callbacks for components
diff: @@ -1387,6 +1387,8 @@ export class QuestionMatrixDropdownModelBase
  onRenderedTableCreatedCallback: (
  table: QuestionMatrixDropdownRenderedTable
  ) => void;
  + onCellCreatedCallback: (options: any) => void;
  + onCellValueChangedCallback: (options: any) => void;
  protected createColumnValues() {
  return this.createNewArray("columns", (item: any) => {
  @@ -1538,6 +1540,9 @@ export class QuestionMatrixDropdownModelBase
  options.cell = cell;
  options.cellQuestion = cell.question;
  options.value = cell.value;
  + if (!!this.onCellCreatedCallback) {
  + this.onCellCreatedCallback(options);
  + }
  this.survey.matrixCellCreated(this, options);
  }
  }
  @@ -2221,6 +2226,9 @@ export class QuestionMatrixDropdownModelBase
  ) {
  if (!this.survey) return;
  var options = this.getOnCellValueChangedOptions(row, columnName, rowValue);
  + if (!!this.onCellValueChangedCallback) {
  + this.onCellValueChangedCallback(options);
  + }
  this.survey.matrixCellValueChanged(this, options);
  }
  validateCell(
  