gRPC logging

[jakubno]

Add a basic logger to orchestrator

it logs every call to the stdout, except health checks and it has a following format

2024-04-16T19:41:43Z	info	finished unary call with code OK	{"grpc.start_time": "2024-04-16T19:41:43Z", "system": "grpc", "span.kind": "server", "grpc.service": "Sandbox", "grpc.method": "Create", "grpc.code": "OK", "grpc.time_ms": 109.469}