dirstate: create new dirstatemap class
This is part of a larger refactor to move the dirstate storage logic to a
separate class, so it's easier to rewrite the dirstate storage layer without
having to rewrite all the algorithms as well.
Step one it to create the class, and replace dirstate._map with it. The
abstraction bleeds through in a few places where the main dirstate class has to
access self._map._map, but those will be cleaned up in future patches.
Differential Revision: https://phab.mercurial-scm.org/D752
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