JDK-8035400 : Move G1ParScanThreadState into its own files
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Recent changes (JDK-8035326, JDK-8035329, JDK-8035330) moved lots of methods into G1ParScanThreadState, and so into G1CollectedHeap.hpp.
Move G1ParScanThreadState into seperate file(s), and try to hide as much as possible in the cpp file.