Move _hooks.Distribution and abc.DistributionFinder to api module
Now that the MetadataPathFinder is adopted in Python 3.8 by PathFinder, there's very little in _hooks
that's a hook. Moreover, we found in #58 (closed) that we couldn't readily move Distribution
to the abc
module because of circular import issues, so abc
doesn't suitably encapsulate all ABCs in the package.
Therefore, I propose to consolidate the now lean _hooks
module and tiny abc
module into api
.