Add gRPC reflection in FastEndpoints.Messaging.Remote

[hamaronooo]

Hello!

Please allow gRPC reflection for FastEndpoints.Messaging.Remote!

That's will be very useful for develop "non-fastendpoints" calls to provided gRPC server by FE lib.
Grpc.AspNetCore.Server package, that you use for FastEndpoints.Messaging.Remote easily allows to add that.

For example please this article from Microsoft docs:
https://learn.microsoft.com/en-us/aspnet/core/grpc/test-tools

With great thanks!

[dj-nitehawk]

we tried to implement grpc reflection for FastEndpoints.Messaging.Remote but couldn't figure out how.
because it uses some low level components from Grpc.AspNetCore and the non-existence of proto files if i remember correctly.
we're gonna need the help of someone who's more familiar with Grpc.AspNetCore to make this happen i think.

i'll leave this issue open in case someone who's able to make it work will come across this and want to submit a PR.

thanks!