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ARROW-9971: [Rust] Improve speed of `take` by 2x-3x (change scaling with batch size)

This PR improves the speed of the `take` kernel by using ~the dark magic~ buffers that @nevi-me thought me in another PR. 😀

Like others PRs, the first commit fixes the benchmarks:
* made them not benchmark array creation
* removed benchmark of i8 since it uses the same code as i32,i64,if32,etc.
* removed size 256 since 512 and 1024 is enough
* added benchmark of take of strings

```
git checkout c2aff01 && cargo bench --bench take_kernels && git checkout take_faster && cargo bench --bench take_kernels
```

Result on my computer:

```
take i32 512            time:   [2.9221 us 2.9282 us 2.9348 us]
                        change: [-46.697% -45.799% -44.703%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 12 outliers among 100 measurements (12.00%)
  5 (5.00%) high mild
  7 (7.00%) high severe

take i32 1024           time:   [5.0237 us 5.0376 us 5.0548 us]
                        change: [-48.840% -48.433% -48.087%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
  3 (3.00%) high mild
  5 (5.00%) high severe

take bool 512           time:   [2.4694 us 2.4765 us 2.4843 us]
                        change: [-50.789% -50.390% -50.012%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
  3 (3.00%) high mild
  3 (3.00%) high severe

take bool 1024          time:   [4.0698 us 4.2407 us 4.4884 us]
                        change: [-51.026% -49.906% -48.535%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 9 outliers among 100 measurements (9.00%)
  5 (5.00%) high mild
  4 (4.00%) high severe

take str 512            time:   [8.1593 us 8.9810 us 10.114 us]
                        change: [-66.908% -57.395% -45.151%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 10 outliers among 100 measurements (10.00%)
  9 (9.00%) high mild
  1 (1.00%) high severe

take str 1024           time:   [12.098 us 12.151 us 12.208 us]
                        change: [-78.241% -75.656% -72.725%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
  1 (1.00%) high mild
  4 (4.00%) high severe
```

Closes #8170 from jorgecarleitao/take_faster

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Andy Grove <andygrove@nvidia.com>