chore(bench): add const-hex to bench

[yjhmelody]

array_bytes::bytes2hex time: [144.29 µs 146.18 µs 149.05 µs]
change: [-1.3871% -0.3029% +0.7608%] (p = 0.61 > 0.05)
No change in performance detected.
Found 11 outliers among 100 measurements (11.00%)
6 (6.00%) high mild
5 (5.00%) high severe
hex::encode time: [149.35 µs 150.45 µs 151.82 µs]
change: [+0.4094% +1.3222% +2.2776%] (p = 0.01 < 0.05)
Change within noise threshold.
Found 14 outliers among 100 measurements (14.00%)
10 (10.00%) high mild
4 (4.00%) high severe
const_hex::encode time: [2.2628 µs 2.3300 µs 2.4055 µs]
change: [+1.2185% +5.2719% +9.5136%] (p = 0.01 < 0.05)
Performance has regressed.
Found 4 outliers among 100 measurements (4.00%)
4 (4.00%) high mild
rustc_hex::to_hex time: [150.38 µs 151.80 µs 153.60 µs]
change: [+0.4301% +1.3696% +2.3517%] (p = 0.00 < 0.05)
Change within noise threshold.
Found 11 outliers among 100 measurements (11.00%)
9 (9.00%) high mild
2 (2.00%) high severe
faster_hex::hex_string time: [17.824 µs 17.926 µs 18.044 µs]
change: [-2.4599% -1.4254% -0.4763%] (p = 0.01 < 0.05)
Change within noise threshold.
Found 9 outliers among 100 measurements (9.00%)
4 (4.00%) high mild
5 (5.00%) high severe
faster_hex::hex_encode_fallback
time: [17.770 µs 17.845 µs 17.932 µs]
change: [-5.5325% -4.6448% -3.8199%] (p = 0.00 < 0.05)
Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
4 (4.00%) high mild
2 (2.00%) high severe
array_bytes::hex2bytes time: [121.79 µs 122.94 µs 124.44 µs]
change: [-8.1342% -5.9473% -3.9038%] (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
array_bytes::hex2bytes_unchecked
time: [104.80 µs 106.83 µs 109.45 µs]
change: [-8.1132% -5.2278% -2.7215%] (p = 0.00 < 0.05)
Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
9 (9.00%) high mild
4 (4.00%) high severe
array_bytes::hex2slice time: [109.99 µs 110.61 µs 111.35 µs]
change: [-16.566% -12.715% -8.9614%] (p = 0.00 < 0.05)
Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
4 (4.00%) high mild
9 (9.00%) high severe
array_bytes::hex2slice_unchecked
time: [106.36 µs 107.01 µs 107.73 µs]
change: [+0.1300% +0.8262% +1.5455%] (p = 0.02 < 0.05)
Change within noise threshold.
Found 15 outliers among 100 measurements (15.00%)
13 (13.00%) high mild
2 (2.00%) high severe
const_hex::decode time: [22.506 µs 22.620 µs 22.746 µs]
change: [-0.9531% -0.1817% +0.5044%] (p = 0.64 > 0.05)
No change in performance detected.
Found 10 outliers among 100 measurements (10.00%)
5 (5.00%) high mild
5 (5.00%) high severe
hex::decode time: [158.77 µs 159.75 µs 160.91 µs]
change: [-4.1689% -1.5886% +0.2738%] (p = 0.20 > 0.05)
No change in performance detected.
Found 7 outliers among 100 measurements (7.00%)
2 (2.00%) high mild
5 (5.00%) high severe
hex::decode_to_slice time: [92.014 µs 92.959 µs 93.992 µs]
change: [-5.6023% -3.8389% -2.1713%] (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
rustc_hex::from_hex time: [164.63 µs 165.58 µs 166.69 µs]
change: [-2.6146% -1.9408% -1.2730%] (p = 0.00 < 0.05)
Performance has improved.
Found 15 outliers among 100 measurements (15.00%)
1 (1.00%) low mild
5 (5.00%) high mild
9 (9.00%) high severe
faster_hex::hex_decode time: [38.787 µs 39.093 µs 39.486 µs]
change: [-1.5174% -0.1346% +1.0835%] (p = 0.85 > 0.05)
No change in performance detected.
Found 6 outliers among 100 measurements (6.00%)
3 (3.00%) high mild
3 (3.00%) high severe
faster_hex::hex_decode_unchecked
time: [16.099 µs 16.178 µs 16.267 µs]
change: [-0.7121% -0.0005% +0.6746%] (p = 1.00 > 0.05)
No change in performance detected.
Found 13 outliers among 100 measurements (13.00%)
4 (4.00%) high mild
9 (9.00%) high severe
faster_hex::hex_decode_fallback
time: [16.057 µs 16.154 µs 16.269 µs]
change: [-0.6458% -0.0882% +0.4780%] (p = 0.75 > 0.05)
No change in performance detected.
Found 15 outliers among 100 measurements (15.00%)
1 (1.00%) low mild
4 (4.00%) high mild
10 (10.00%) high severe