interfaces: create a new folder for interfaces and move repository.py in it...
interfaces: create a new folder for interfaces and move repository.py in it
I was trying to understand current interfaces and write new ones and I realized
we need to improve how current interfaces are organised. This creates a
dedicated folder for defining interfaces and move `repository.py` which defines
all the current interfaces inside it.
Differential Revision:
https://phab.mercurial-scm.org/D6741
