[SPARK-15824][SQL] Execute WITH .... INSERT ... statements immediately

## What changes were proposed in this pull request?
We currently immediately execute `INSERT` commands when they are issued. This is not the case as soon as we use a `WITH` to define common table expressions, for example:
```sql
WITH
tbl AS (SELECT * FROM x WHERE id = 10)
INSERT INTO y
SELECT *
FROM   tbl
```

This PR fixes this problem. This PR closes https://github.com/apache/spark/pull/13561 (which fixes the a instance of this problem in the ThriftSever).

## How was this patch tested?
Added a test to `InsertSuite`

Author: Herman van Hovell <hvanhovell@databricks.com>

Closes #13678 from hvanhovell/SPARK-15824.