core/vm: optimze emit event using uint256.WriteToArray32

[cuiweixie]

goos: darwin
goarch: arm64
pkg: github.com/ethereum/go-ethereum/core/vm
cpu: Apple M1 Pro
        │   old.txt   │              new.txt               │
        │   sec/op    │   sec/op     vs base               │
Log3-10   269.0n ± 6%   250.8n ± 3%  -6.75% (p=0.000 n=20)

        │  old.txt   │           new.txt            │
        │    B/op    │    B/op     vs base          │
Log3-10   627.0 ± 1%   629.0 ± 1%  ~ (p=0.963 n=20)

        │  old.txt   │            new.txt             │
        │ allocs/op  │ allocs/op   vs base            │
Log3-10   9.000 ± 0%   9.000 ± 0%  ~ (p=1.000 n=20) ¹
¹ all samples are equal