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ARROW-10986: [Rust][DataFusion] Add average stats to TPC-H benchmarks

Tool now outputs average statistic based on all iterations.
Also data is collected with more precision.

Output:

```
Query 12 iteration 0 took 1076.5 ms
Query 12 iteration 1 took 1064.9 ms
Query 12 iteration 2 took 1056.3 ms
Query 12 iteration 3 took 1095.2 ms
Query 12 iteration 4 took 1069.5 ms
Query 12 iteration 5 took 1082.0 ms
Query 12 iteration 6 took 1076.2 ms
Query 12 iteration 7 took 1053.5 ms
Query 12 iteration 8 took 1139.2 ms
Query 12 iteration 9 took 1051.1 ms
Query 12 avg time: 1076.45 ms
```

Closes #8970 from Dandandan/stats

Authored-by: Heres, Daniel <danielheres@gmail.com>
Signed-off-by: Andy Grove <andygrove73@gmail.com>