hg-core: define a `dirstate_status` `Operation`...
hg-core: define a `dirstate_status` `Operation`
This is 3/3 in a series of patches to improve dirstate status' code.
Following in the footsteps of a46e36b82461, we move the main status
functionality to an `Operation`. This will most likely be subject to change in
the future (what function signature, what parameters, etc., but we will see
when `rhg` gets `hg status` support.
Differential Revision:
https://phab.mercurial-scm.org/D8663
