Improvement: Include Forked repositories in GHRepositorySearchBuilder

[tied]

As a user of your library,
I want to use the GHRepositorySearchBuilder class to find my forked repositories
so that I'm able to automate fetch upstream.

Current implementation

The GHRepositorySearchBuilder has a forks method. But this is for searching for how many time a repository was forked and not if the repository itself is a fork.

Expected implementation

Add a fork method to GHRepositorySearchBuilder so that t can add the parameters true or only to search for repositories that I have forked.

References

• https://docs.github.com/en/github/searching-for-information-on-github/searching-on-github/searching-for-repositories

[tied]

That would be the required changes: tied@af82b8b