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ARROW-10665: [Rust] like/nlike utf8 scalar fast paths, bug fixes in like/nlike

Commonly used patterns '%xxx'  'xxx%' and 'xxx' can use faster methods from Rust standard lib instead.

```
like_utf8 scalar equals time:   [828.13 us 830.08 us 832.39 us]
                        change: [-43.306% -42.962% -42.610%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 12 outliers among 100 measurements (12.00%)

like_utf8 scalar ends with
                        time:   [927.93 us 929.31 us 930.88 us]
                        change: [-59.220% -59.149% -59.082%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

like_utf8 scalar starts with
                        time:   [930.96 us 931.70 us 932.63 us]
                        change: [-43.537% -43.432% -43.325%] (p = 0.00 < 0.05)
                        Performance has improved.
```

Also tried fast path for contains (`%xxx%`), but that was (almost 2 times) slower than using the regex.

Closes #8723 from Dandandan/like_utf8_fast_paths

Lead-authored-by: Heres, Daniel <danielheres@gmail.com>
Co-authored-by: Daniël Heres <danielheres@gmail.com>
Signed-off-by: Jorge C. Leitao <jorgecarleitao@gmail.com>