Create latest release entity when a repo is created

[eleftherias]

When a GitHub repo is created in Minder, e.g by running minder repo register we should query GitHub for the latest release associated with that repo and create a Minder release entity.

[eleftherias]

Adding the GitHub endpoint for getting the latest release https://docs.github.com/en/rest/releases/releases?apiVersion=2022-11-28#get-the-latest-release