message: Added TabularTable Feature and FeatureUnsupportedReason enums
diff: var vpaModel = new VpaModel(daxModel);
  var databaseETag = TabularModelHelper.GetDatabaseETag(vpaModel.Model.ModelName.Name, vpaModel.Model.Version, vpaModel.Model.LastUpdate);
  var databaseSize = vpaModel.Columns.Sum((c) => c.TotalSize);
  + var tabularTables = vpaModel.Tables.Select(TabularTable.CreateFrom).ToArray();
  var tabularColumns = vpaModel.Columns.Select((c) =>
  {
  return column;
  }).ToArray();
  - var tabularTables = vpaModel.Tables.Select((t) =>
  - {
  - var table = new TabularTable
  - {
  - Name = t.TableName,
  - RowsCount = t.RowsCount,
  - Size = t.TableSize
  - };
  -
  - return table;
  - }).ToArray();
  -
  var tabularMeasures = daxModel.Tables.SelectMany((t) => t.Measures).Select((m) =>
  {
  var (expression, lineBreakStyle) = m.MeasureExpression.Expression.NormalizeDax();
  