[SPARK-17460][SQL] Make sure sizeInBytes in Statistics will not overflow

## What changes were proposed in this pull request?

1. In SparkStrategies.canBroadcast, I will add the check   plan.statistics.sizeInBytes >= 0
2. In LocalRelations.statistics, when calculate the statistics, I will change the size to BigInt so it won't overflow.

## How was this patch tested?

I will add a test case to make sure the statistics.sizeInBytes won't overflow.

Author: Huaxin Gao <huaxing@us.ibm.com>

Closes #16175 from huaxingao/spark-17460.