[Feature] GitHub workflow tasks

[jptissot]

Build workflow tasks that allow a user to:

• Create a GitHub branch
• Create Single file commits to branch and push them
• Create a GitHub Pull Request for any branch

These tasks should use an api token that is encrypted in the database.

[brendangadd]

@jptissot Is this a prerequisite for StatCan/aaw#2?

[jptissot]

@brendangadd Yes.
I thought we could simply use the GitHub Api (via http request as supported by OC's workflows) but it turns out this was harder than I initially thouught. So, I am making a OC Module that uses Octokit.net to interact with the api. This will be reusable for all sites as it is being implemented in a OC Module.