Create artifact generation script

[omus]

Creating the artifact generation script which will eventually be used by CI to perform automatic updates of this package. The order of operations is as follows:

1. Build the tzdata into the compiled tzjdata
2. Generate a tarball containing the tzjdata
3. Bump the version of the TZJData.jl package
4. Create the Artifact.toml with the future GitHub release asset URLs
5. Add and commit the changes to the Project.toml and Artifacts.toml
6. Push the new commit
7. Tag the new commit and create a new GitHub release associated with the new commit. Then upload the tarball as a GitHub release asset.

There is additional work that should be done on this script and hopefully the reusable pieces can eventually make it into ArtifactUtils.jl. For now in order to make a new TimeZones.jl release that uses the artifacts created here I'm just going to get this merged as is and make the initial 0.0.1 release.