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ARROW-12390: [Rust] Inline from_trusted_len_iter, try_from_trusted_len_iter, extend_from_slice

This helps with further optimizing performance on quite some kernels:

```
length                  time:   [721.26 ns 725.59 ns 731.42 ns]
                        change: [-69.510% -69.125% -68.566%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
  7 (7.00%) high mild
  4 (4.00%) high severe
take i32 512            time:   [376.15 ns 378.51 ns 381.09 ns]
                        change: [-18.681% -18.212% -17.542%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
  3 (3.00%) high mild
  2 (2.00%) high severe

take i32 1024           time:   [640.71 ns 641.87 ns 643.19 ns]
                        change: [-28.880% -28.695% -28.516%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
  2 (2.00%) high mild
  1 (1.00%) high severe

take i32 nulls 512      time:   [634.80 ns 635.63 ns 636.56 ns]
                        change: [-24.797% -23.403% -22.272%] (p = 0.00 < 0.05)
                        Performance has improved.

take i32 nulls 1024     time:   [1.0084 us 1.0093 us 1.0103 us]
                        change: [-44.482% -42.312% -40.209%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
  1 (1.00%) low mild
  5 (5.00%) high mild
  2 (2.00%) high severe

take bool 512           time:   [1.4068 us 1.4188 us 1.4315 us]
                        change: [-49.139% -48.684% -48.208%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
  2 (2.00%) high mild

take bool 1024          time:   [2.6662 us 2.6807 us 2.6973 us]
                        change: [-55.452% -55.133% -54.803%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

take bool nulls 512     time:   [1.3331 us 1.3452 us 1.3617 us]
                        change: [-31.198% -30.327% -29.414%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
  1 (1.00%) high mild
  2 (2.00%) high severe

take bool nulls 1024    time:   [2.4789 us 2.4968 us 2.5229 us]
                        change: [-40.358% -39.969% -39.558%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 4 outliers among 100 measurements (4.00%)
  3 (3.00%) high mild
  1 (1.00%) high severe

```

FYI @jorgecarleitao

Closes #10039 from Dandandan/inline_from_trusted_len_iter

Authored-by: Heres, Daniel <danielheres@gmail.com>
Signed-off-by: Andrew Lamb <andrew@nerdnetworks.org>