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ARROW-9966: [Rust] Speedup kernels for sum,min,max by 10%-60%

This PR speeds up some of the aggregations in arrow by 10-60% by simplifying their logic and overall allowing the optimizer to do its work.

The first 3 commits (up to 29754d7) simply improve the benchmark itself by:
* not taking the creation of the arrays into account, only the computation,
* moving it to another file
* adding randomness to the data to reduce spurious results due to speculative execution and others
* add case for data with nulls, since the kernels branch out on that condition

The last 3 commits are the optimizations themselves.

```
sum 512                 time:   [535.66 ns 536.11 ns 536.57 ns]
                        change: [-58.421% -58.222% -57.957%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
  4 (4.00%) high mild
  6 (6.00%) high severe

min 512                 time:   [766.77 ns 775.85 ns 788.35 ns]
                        change: [-41.555% -41.017% -40.388%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
  4 (4.00%) high mild
  6 (6.00%) high severe

sum nulls 512           time:   [1.0968 us 1.1000 us 1.1038 us]
                        change: [-8.9918% -7.6232% -5.7130%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 15 outliers among 100 measurements (15.00%)
  3 (3.00%) high mild
  12 (12.00%) high severe

min nulls 512           time:   [1.3208 us 1.3242 us 1.3286 us]
                        change: [-11.028% -10.240% -9.4581%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
  3 (3.00%) high mild
  8 (8.00%) high severe
```

Command:
```
git checkout 29754d7 && cargo bench --bench aggregate_kernels && git checkout agg_arrow && cargo bench --bench aggregate_kernels
```

Closes #8165 from jorgecarleitao/agg_arrow

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Neville Dipale <nevilledips@gmail.com>