transfer buffer from worker results / from main loadercontext to worker

[kwonoj]

loaderrunner's result is json object, some of properties are buffer. May able to split and transfer possible valies (since worker's result won't be accessed in worker after result being sent to main thread anyway), let other object uses structured clone still.

[kwonoj]

Also need to confirm transfer loadercontext's value to worker is allowed in webpack compiler.

[kwonoj]

#23 for worker -> main process side.