feat(bigquery): update the API

#### bigquery:v2
The following keys were added:
- schemas.ArimaForecastingMetrics.description
- schemas.ArimaForecastingMetrics.id
- schemas.ArimaForecastingMetrics.properties.arimaFittingMetrics.description
- schemas.ArimaForecastingMetrics.properties.arimaFittingMetrics.items.$ref
- schemas.ArimaForecastingMetrics.properties.arimaFittingMetrics.type
- schemas.ArimaForecastingMetrics.properties.arimaSingleModelForecastingMetrics.description
- schemas.ArimaForecastingMetrics.properties.arimaSingleModelForecastingMetrics.items.$ref
- schemas.ArimaForecastingMetrics.properties.arimaSingleModelForecastingMetrics.type
- schemas.ArimaForecastingMetrics.properties.hasDrift.description
- schemas.ArimaForecastingMetrics.properties.hasDrift.items.type
- schemas.ArimaForecastingMetrics.properties.hasDrift.type
- schemas.ArimaForecastingMetrics.properties.nonSeasonalOrder.description
- schemas.ArimaForecastingMetrics.properties.nonSeasonalOrder.items.$ref
- schemas.ArimaForecastingMetrics.properties.nonSeasonalOrder.type
- schemas.ArimaForecastingMetrics.properties.seasonalPeriods.description
- schemas.ArimaForecastingMetrics.properties.seasonalPeriods.enumDescriptions
- schemas.ArimaForecastingMetrics.properties.seasonalPeriods.items.enum
- schemas.ArimaForecastingMetrics.properties.seasonalPeriods.items.type
- schemas.ArimaForecastingMetrics.properties.seasonalPeriods.type
- schemas.ArimaForecastingMetrics.properties.timeSeriesId.description
- schemas.ArimaForecastingMetrics.properties.timeSeriesId.items.type
- schemas.ArimaForecastingMetrics.properties.timeSeriesId.type
- schemas.ArimaForecastingMetrics.type
- schemas.ArimaSingleModelForecastingMetrics.description
- schemas.ArimaSingleModelForecastingMetrics.id
- schemas.ArimaSingleModelForecastingMetrics.properties.arimaFittingMetrics.$ref
- schemas.ArimaSingleModelForecastingMetrics.properties.arimaFittingMetrics.description
- schemas.ArimaSingleModelForecastingMetrics.properties.hasDrift.description
- schemas.ArimaSingleModelForecastingMetrics.properties.hasDrift.type
- schemas.ArimaSingleModelForecastingMetrics.properties.nonSeasonalOrder.$ref
- schemas.ArimaSingleModelForecastingMetrics.properties.nonSeasonalOrder.description
- schemas.ArimaSingleModelForecastingMetrics.properties.seasonalPeriods.description
- schemas.ArimaSingleModelForecastingMetrics.properties.seasonalPeriods.enumDescriptions
- schemas.ArimaSingleModelForecastingMetrics.properties.seasonalPeriods.items.enum
- schemas.ArimaSingleModelForecastingMetrics.properties.seasonalPeriods.items.type
- schemas.ArimaSingleModelForecastingMetrics.properties.seasonalPeriods.type
- schemas.ArimaSingleModelForecastingMetrics.properties.timeSeriesId.description
- schemas.ArimaSingleModelForecastingMetrics.properties.timeSeriesId.type
- schemas.ArimaSingleModelForecastingMetrics.type
- schemas.EvaluationMetrics.properties.arimaForecastingMetrics.$ref
- schemas.EvaluationMetrics.properties.arimaForecastingMetrics.description
- schemas.SnapshotDefinition.id
- schemas.SnapshotDefinition.properties.baseTableReference.$ref
- schemas.SnapshotDefinition.properties.baseTableReference.description
- schemas.SnapshotDefinition.properties.snapshotTime.description
- schemas.SnapshotDefinition.properties.snapshotTime.format
- schemas.SnapshotDefinition.properties.snapshotTime.type
- schemas.SnapshotDefinition.type
- schemas.Table.properties.snapshotDefinition.$ref
- schemas.Table.properties.snapshotDefinition.description
- schemas.TrainingOptions.properties.autoArima.description
- schemas.TrainingOptions.properties.autoArima.type
- schemas.TrainingOptions.properties.dataFrequency.description
- schemas.TrainingOptions.properties.dataFrequency.enum
- schemas.TrainingOptions.properties.dataFrequency.enumDescriptions
- schemas.TrainingOptions.properties.dataFrequency.type
- schemas.TrainingOptions.properties.holidayRegion.description
- schemas.TrainingOptions.properties.holidayRegion.enum
- schemas.TrainingOptions.properties.holidayRegion.enumDescriptions
- schemas.TrainingOptions.properties.holidayRegion.type
- schemas.TrainingOptions.properties.horizon.description
- schemas.TrainingOptions.properties.horizon.format
- schemas.TrainingOptions.properties.horizon.type
- schemas.TrainingOptions.properties.includeDrift.description
- schemas.TrainingOptions.properties.includeDrift.type
- schemas.TrainingOptions.properties.nonSeasonalOrder.$ref
- schemas.TrainingOptions.properties.nonSeasonalOrder.description
- schemas.TrainingOptions.properties.timeSeriesDataColumn.description
- schemas.TrainingOptions.properties.timeSeriesDataColumn.type
- schemas.TrainingOptions.properties.timeSeriesIdColumn.description
- schemas.TrainingOptions.properties.timeSeriesIdColumn.type
- schemas.TrainingOptions.properties.timeSeriesTimestampColumn.description
- schemas.TrainingOptions.properties.timeSeriesTimestampColumn.type

The following keys were changed:
- schemas.EvaluationMetrics.properties.rankingMetrics.description
- schemas.Model.properties.modelType.enum
- schemas.Model.properties.modelType.enumDescriptions
- schemas.Table.properties.type.description