SBG may fail when parsing big JS files

[vmutafov]

If there are many big JS files to be parsed by the JS parser in the SBG, it may fail with V8 Out-of-Memory exception. This happens rarely but, still, there might be a problem with the default webpack flow.

The JS parser in the SBG is ran as a Node process and if it is not started with a max heap size flag it uses V8's default heap size which is around 1.7gb.

We should start the Node process with a bigger available amount of memory but still allow users to provide the NODE_OPTIONS environment variable to manually change the Node configs.