Add runtime detection of V8 memory cage #3384

When using the V8 memory cage, Buffers cannot be wrapped and then
later freed via a callback. When the cage is detected via a throw,
instead fall back to copying Buffer contents to V8 memory.

This approach will be used by Electron 21+ and you should expect
reduced performance and increased memory consumption/fragmentation.

src/pipeline.cc

@@ -1206,8 +1206,8 @@ class PipelineWorker : public Napi::AsyncWorker {
         // Add buffer size to info
         info.Set("size", static_cast<uint32_t>(baton->bufferOutLength));
         // Pass ownership of output data to Buffer instance
-        Napi::Buffer<char> data = Napi::Buffer<char>::New(env, static_cast<char*>(baton->bufferOut),
-          baton->bufferOutLength, sharp::FreeCallback);
+        Napi::Buffer<char> data = sharp::NewOrCopyBuffer(env, static_cast<char*>(baton->bufferOut),
+          baton->bufferOutLength);
         Callback().MakeCallback(Receiver().Value(), { env.Null(), data, info });
       } else {
         // Add file size to info