[source-gitlab] Add timelogs stream for time tracking information

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The GitLab source connector already has many streams for most of the important REST API endpoints, but it's missing any time tracking information. I looked it up and the detailed time tracking information can only be requested from the GraphQL API, which probably explains why it wasn't initially added to the connector.

Would a timelogs stream be an accepted addition to the GitLab source connector? I have a local version of the connector where this change is already implemented for personal use. If this would be a welcome change and I find the time for it, I'd be happy to contribute the code (although it's a bit messy currently and would probably need to be cleaned up first). I would need some help with the contribution as I can't run the timelogs stream in connection builder for some reason, even though it works when used in real connections.