feat: add method to RouteContext (#1808)

[zoomiti]

Closes #1808

[zoomiti]

@yokomizer is this a solution that works for your use case?

[zoomiti]

This is the second time server_fn has failed to run its CI on my PR's. I want to look into this

[gbj]

@zoomiti The server fn CI issue is just that there are now so many features to enable all the encodings that, when the CI runs, it runs out of space checking all the combinations. We just need to disable some of the feature combos and it will be fine.

[zoomiti]

I forgor to add docs to the new method

[gbj]

Thanks, this looks great! A clever way of handling it that I had not thought of (providing it via context, on the server). 🎉

[zoomiti]

Unless I'm wrong I thought this was your idea!
#1808 (comment)