github: add GitHubAPI, GitHubAPIClient classes (bug 1989637)#536

zzzeid merged 1 commit intozeid/bug-1989635-github-pr-pilotmozilla-conduit/lando:zeid/bug-1989635-github-pr-pilotfrom

zeid/bug-1989637-github-api-clientmozilla-conduit/lando:zeid/bug-1989637-github-api-clientCopy head branch name to clipboard