dirstate-item: feed more information to `__init__` Instead of processing the "rich" value at the `dirstatemap` level, we can now directly pass them to the DirstateItem object. This will make the object free to store whatever its want and to implements it logic whatever its want. For now… we simply process the flag and store the same good old value. However this pave the way for doing things differently once the rest of dirstatemap code is updated. Nobody call this code yet. Differential Revision: https://phab.mercurial-scm.org/D11320