Support keyed services

[JamesNK]

.NET 8 added keyed services. Ensure DI on interceptors and services work with keyed services.

[vadimi-ep]

It looks like keyed services still don't work in gRPC services, is there a plan to support them?

[JamesNK]

How don’t they work?

[vadimi-ep]

My apologies, I use Lamar container and FromKeyedServices attribute is being ignored, I just retested with the default DI and everything is working perfectly fine. I will report the issue to lamar repo. Thanks.

[JamesNK]

Closing issue as tests were added here to verify this works - #2356