Context-aware URL properties or extensions

[GreemDev]

Hello!

I had an idea of forking the NGitLab project and adding context-aware URL getters similar to what you can find in Octokit.
This would essentially use the existing data you provide for any API requests to get an object, to provide these URLs.

Take my usage: https://git.ryujinx.app

If I make a GitLabClient, then request, say, an issue or merge request, the context of what I'm asking for is passed onto the returned object, so you can simply use mergeRequest.BrowserUrl (or something similar) to embed the base server url + project id + sub paths to the object.

A simpler implementation would be to expose the ProjectId on each ISomethingClient, and we can write the URL construction logic ourselves.