Get owner's repositorie's activity

When looking at Github's documentation, https://docs.github.com/en/rest/repos/repos?apiVersion=2022-11-28#list-repository-activities, there is an endpoint `https://api.github.com/repos/OWNER/REPO/activity`
Good to have it implemented.

PS: do you have t tutorial on how to modify an existing bundle? Bescause I think of doing it...

Start by reviewing the GitHub REST documentation for the repository activities endpoint and locating the existing repository-related API entry points in this PHP client. Check how comparable endpoints are exposed and tested. Done means the OWNER/REPO activity endpoint is available through the client with coverage consistent with the surrounding repository APIs.

索引モデルが issue の本文から書いたものです。