Add google workspace OIDC group support

[SLoeuillet]

• read the CONTRIBUTING guidelines
• raised a GitHub issue or discussed it on the projects chat beforehand
• added unit tests
• added integration tests
• updated documentation if needed
• updated CHANGELOG.md

[kradalby]

Hi

This is a new feature and per our contribution guidelines, we need to first have an issue with a discussion if this is something that we can support and what the usecase is for this feature.

I noticed that there are not integration tests, which would also be a requirement.

[SLoeuillet]

Sorry, I went to the Discord server 2 weeks ago and ask if someone would be interrested in the feature and someone told me to open a PR.

Just created issue #1861

[vsychov]

Do we really need it here? We could potentially utilize something like DEX to fetch groups from Google Workspace.