CLI: Add flag to push TF weights directly into main
# What does this PR do?

Adds the `--push` flag to the `pt-to-tf` CLI, to enabling pushing straight to main (assuming the user has the right permissions).

Why am I adding this flag? A few users mentioned that they would be interested in having TF weights silently pushed straight into their repos. With this flag, I can start building a local midnight cronjob to automate the conversions (starting with pushes for users that requested it, then PR opening on users interested in PRs, then 1 PR per user if not whitelisted), which can eventually be moved into a separate machine to continuously feed the TF ecosystem 🔥 
Yes yes yes! Maybe users could just set a flag, like "auto-convert my weights" and then we could have a machine that tracks their repos, looks for weights files that have changed and auto-updates versions for the other frameworks?<|||||>_The documentation is not available anymore as the PR was closed or merged._