Add watchOptions to Config

[hoangle4]

I was looking around and there isn't a way to add watchOptions to webpack configs. Without watchOptions, react-scripts can't see changes update from a remote PC or when dev is running inside a vm.

Purpose ENVs.

WDS_POLLING=true
WDS_AGGREGATE_TIMEOUT=200
WDS_POLLING_INTERVAL=1000
WSD_WATCH_IGNORE=**/node_modules

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