Incorporate grid-service-websrv into program.

[jf-06]

Port the code for the grid-service-websrv to C# and allow it to be run as a daemon alongside the grid bot (optionally).

Implements the following:

• asset delivery proxy -- forcing less reliance on prod dct
• avatar-fetch v2 conversion to v1.1 proxy -- allows correct avatar loading for v1.1 models.
• client app settings -- can be in memory, loaded from json or vault.
• optional, but ephemeral counters for recording grid server metrics.

This issue is a bit of a two parter, it also calls to move the gRPC based code into its own assembly to clean up Runner.cs as it is getting cluttered

We will use the default routing methods instead of controllers.

Another case to consider with this is the system hogging https ports etc, or you already have some proxy server running e.g. Traefik or Nginx. For this case I will allow the listen port to be customised, as well as allow HTTPs to not be forced.

As always, this server will be a toggeable feature, and will not be forced to run.