dirstate: align the dirstate's API to the lower level ones
This conclude the refactoring of this API. We can now finalize the dirstate v2
on disk format.
Differential Revision: https://phab.mercurial-scm.org/D11587
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"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}