Investigate increasing Maintainer Productivity with Pull Requests Environments

I would like to make life easier for Lazygit maintainers by implementing [Uffizzi](https://github.com/UffizziCloud/uffizzi) previews.
Disclaimer: I work on [Uffizzi](https://github.com/UffizziCloud/uffizzi)
Uffizzi is a Open Source full stack previews engine and is completely free for Lazygit (and all open source projects). This will provide maintainers with previews of their PRs in the cloud, allowing them iterate faster and reduce time to merge.

TODO:

- [ ] Intial POC