.arcconfig

stream-clone: make it the responsability of the store entry to stream content

The store entry has more context, this will especially be true when it comes to
revlogs. So we move the details of how to retrieve binary content to the
StoreEntry. The stream clone code now focus on the protocol bits.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "phabricator.uri": "https://phab.mercurial-scm.org/",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}