Support URL rewrite for Temporal UI when instrumenting via server golang package

[manitgupta]

Is your feature request related to a problem? Please describe.

Our usecase is very much similar to https://github.com/temporalio/ui/issues/911, with the difference that we plan to run the temporal server in a goroutine from inside a binary using the server package.

Describe the solution you'd like

The binary would run a web server. We should like a subpath of the webserver to be able to serve the temporal UI.

Describe alternatives you've considered

We have an integrated product, so the other option would be to look at the APIs that the temporal UI calls and then replicate the UI logic and build our own frontend. This would be a big investment and we would like to avoid it if possible.

Additional context

Requirement is very similar to https://github.com/temporalio/ui/issues/911