[SPARK-21323][SQL] Rename plans.logical.statsEstimation.Range to ValueInterval

## What changes were proposed in this pull request?

Rename org.apache.spark.sql.catalyst.plans.logical.statsEstimation.Range to ValueInterval.
The current naming is identical to logical operator "range".
Refactoring it to ValueInterval is more accurate.

## How was this patch tested?

unit test

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Wang Gengliang <ltnwgl@gmail.com>

Closes #18549 from gengliangwang/ValueInterval.