Add 'max_time_travel_hours ' support on BQ module

[lcaggio]

Add 'max_time_travel_hours ' support on BQ module with default value .

The current module cause a continue 'tf apply' change due to the missing default value.

  ~ resource "google_bigquery_dataset" "default" {
        id                              = "projects/PROJECT_ID/datasets/DATASET_NAME"
      - max_time_travel_hours           = "168" -> null
        # (12 unchanged attributes hidden)

        # (5 unchanged blocks hidden)
    }