Describe your environment

Ubuntu 20.04
x86_64
Python 3.10.9

Steps to reproduce

I'll post a PR that addresses the issue with a test that reproduces the problem shortly.
This problem can be triggered by running the grpc instrumentation and utilizing Unix sockets for connections.

server.add_insecure_port("unix:///tmp/grpc.sock")
channel = grpc.insecure_channel("unix:///tmp/grpc.sock")

What is the expected behavior?

The grpc instrumentation should collect traces when running on a Unix socket.

What is the actual behavior?

A ValueError is thrown here:
https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/instrumentation/opentelemetry-instrumentation-grpc/src/opentelemetry/instrumentation/grpc/_server.py#L254-L256

context.peer() is unix: which results in ip, port = [""].