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twoeths afdf325ebf feat: fromHexInto() api (#8275 )

**Motivation**

- improve the time to deserialize hex, especially for getBlobsV2() where
each blob is 131kb
- if the benchmark is correct, we can expect the time to deserialize
blob hex from `332.6842 ms/op` to more or less 2ms
- will apply it for getBlobsV2() in the next PR by preallocate some
memory and reuse it for all slots

**Description**

- implement `fromHexInto()` using `String.charCodeAt()` for browser and
use that for NodeJs as well
- the Buffer/NodeJS implementation is too bad that I only maintain it in
the benchmark

**Test result on a regular lodestar node**
- `browser fromHexInto(blob)` is 1000x faster than `browser
fromHex(blob)` and >100x faster than `nodejs fromHexInto(blob) `

```
packages/utils/test/perf/bytes.test.ts
  bytes utils
    ✔ nodejs block root to RootHex using toHex                             2817687 ops/s    354.9010 ns/op        -       1324 runs  0.897 s
    ✔ nodejs block root to RootHex using toRootHex                         4369044 ops/s    228.8830 ns/op        -       1793 runs  0.902 s
    ✔ nodejs fromhex(blob)                                                3.005854 ops/s    332.6842 ms/op        -         10 runs   4.18 s
    ✔ nodejs fromHexInto(blob)                                            3.617654 ops/s    276.4222 ms/op        -         10 runs   3.36 s
    ✔ browser block root to RootHex using the deprecated toHexString       1656696 ops/s    603.6110 ns/op        -        963 runs   1.34 s
    ✔ browser block root to RootHex using toHex                            2060611 ops/s    485.2930 ns/op        -        424 runs  0.812 s
    ✔ browser block root to RootHex using toRootHex                        2320476 ops/s    430.9460 ns/op        -        889 runs  0.841 s
    ✔ browser fromHexInto(blob)                                           503.7166 ops/s    1.985243 ms/op        -         10 runs   21.9 s
    ✔ browser fromHex(blob)                                              0.5095370 ops/s    1.962566  s/op        -         10 runs   21.7 s
```

---------

Co-authored-by: Tuyen Nguyen <twoeths@users.noreply.github.com>

2025-08-27 09:20:15 -04:00