Ensure __version__ is exposed

[uogbuji]

Yes we can do

from importlib.metadata import version
print(version('ogbujipt'))

or

import pkg_resources
pkg_resources.get_distribution('ogbujipt').version

But we also want to allow the conventional

import ogbujipt
print(ogbujipt.__version__)

[uogbuji]

Didn't know how much of a pain this would be for a hatch app, but it turned out to be simple enough. Implemented in main.