Add script for identifying commits in release branches

One of the worst parts of a Podman release is writing the release
notes. It requires manually going through all merged commits
since the last release, figuring out what was actually done, and
writing a small blurb about what was fixed. The worst part of
this is the difficulty in finding the commits that were actually
included in previous releases - our extensive backports to prior
releases mean that there are usually dozens of commits that were
included in a prior release, but do not have a matching SHA (as
the original author did not do the backport, and often the commit
required massaging to cherry-pick in).

This script automates the job of finding commits in one release
branch that are not in another, with filtering to remove most
cherry-picked commits. It makes my life a lot easier during
releases, so I figured I'd include it in hack/ so anyone else
stuck with the enjoyable task of writing release notes can have a
slightly easier life.

The script is written in absolutely terrible Ruby and its
performance is absolutely terrible, but you only need to run it
once per major release and a 30-second wait to generate the list
of commits to include isn't bad.

Signed-off-by: Matthew Heon <mheon@redhat.com>

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