nitroAllocBytes method
Copies bytes into a <lib>_nitro_alloc'd buffer — for framed payloads
whose ownership transfers to native, such as a @HybridRecord returned
from a Dart callback. The C side frees it with its own free.
Implementation
int nitroAllocBytes(Uint8List bytes) {
final p = nitroAlloc(bytes.length);
writeBytes(p, bytes);
return p;
}