dirstate-tree: Implement DirstateMap::read
This reads the on-disk dirstate in its current format (a flat sequence of
entries) and creates a tree in memory.
Differential Revision: https://phab.mercurial-scm.org/D10367
from .cbor2 import (
CBORDecodeError,
CBORDecoder,
CBOREncodeError,
CBOREncoder,
dump,
dumps,
load,
loads,
)