gRPC-web to gRPC translation

### What should we add or change to make your life better?

Support gRPC-web to gRPC translation.

### Why is this important to you?

Many language platforms lack gRPC-web support - C++, Python, Node.js. The only reverse proxy officially supporting gRPC-web to gRPC translation is Envoy. But if .NET YARP is already employed in some product and it supports gRPC-web to gRPC translation then it would be a more lightweight solution to integrate services written in other languages and expose their API to HTML frontend.