[SPARK-12888][SQL] benchmark the new hash expression

Benchmark it on 4 different schemas, the result:
```
Intel(R) Core(TM) i7-4960HQ CPU  2.60GHz
Hash For simple:                   Avg Time(ms)    Avg Rate(M/s)  Relative Rate
-------------------------------------------------------------------------------
interpreted version                       31.47           266.54         1.00 X
codegen version                           64.52           130.01         0.49 X
```

```
Intel(R) Core(TM) i7-4960HQ CPU  2.60GHz
Hash For normal:                   Avg Time(ms)    Avg Rate(M/s)  Relative Rate
-------------------------------------------------------------------------------
interpreted version                     4068.11             0.26         1.00 X
codegen version                         1175.92             0.89         3.46 X
```

```
Intel(R) Core(TM) i7-4960HQ CPU  2.60GHz
Hash For array:                    Avg Time(ms)    Avg Rate(M/s)  Relative Rate
-------------------------------------------------------------------------------
interpreted version                     9276.70             0.06         1.00 X
codegen version                        14762.23             0.04         0.63 X
```

```
Intel(R) Core(TM) i7-4960HQ CPU  2.60GHz
Hash For map:                      Avg Time(ms)    Avg Rate(M/s)  Relative Rate
-------------------------------------------------------------------------------
interpreted version                    58869.79             0.01         1.00 X
codegen version                         9285.36             0.06         6.34 X
```

Author: Wenchen Fan <wenchen@databricks.com>

Closes #10816 from cloud-fan/hash-benchmark.