RFR(XS) 8252056 Move DumpRegion/ReadClosure/WriteClosure to archiveUtils.hpp

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8252056
http://cr.openjdk.java.net/~iklam/jdk16/8252056-move-dump-region-to-archive-utils.v01/

Part of CDS code clean up:

The classes are currently in metaspaceShared.hpp/cpp, which are too big.
It's better to move these utility classes to archiveUtils.cpp/hpp

Thanks
- Ioi