RFR: 2069: Add group and collaborator methods to Forge and HostedRepository

[Zhao Song]

On Thu, 19 Oct 2023 21:19:35 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This patch adds some new methods on Forge and HostedRepository to interact with forge groups and repository collaborators respectively. It also adds a lot more possible customization to the test class `CensusBuilder` as well as adding some missing `final` declarations in test classes. All the new API calls have manual tests added. It's quite large for what it is, but isn't really affecting any current production code.

I took a quick look, and it looks good, but we need to update the copyright and add copyright for new files.

-------------

PR Comment: https://git.openjdk.org/skara/pull/1573#issuecomment-1771838008