Allow adding a `grpc.service_config` without having to specify each service name.

[martyphee]

Is your feature request related to a problem? Please describe.

When specifying grpc.service_config we have to specify each service in the name configuration or an error is thrown.

Example

"grpc.service_config": JSON.stringify({
    methodConfig: [
      {
        name: [{ service: "org.grpc.service.v1.PolicyManagementService" }],
        timeout: {
          seconds: 5,
          nanos: 0
        }
      }
    ]
  })

Describe the solution you'd like

Could we make the name optional like [{}]? We do this in our Python and Scala services and it works as expected.

Describe alternatives you've considered

An alternative might be a wildcard like org.grpc.*

Additional context

Might just be the project I'm using this on but it needs to interact with a number of services and I would need to list them all. It's not a huge deal but it would be nice if it worked like other gRPC libraries.

Here is a sample from on of our Python applications which is in production.

import json

import grpc
from grpc.aio import insecure_channel, secure_channel

from app.configuration import configuration

OPTIONS = [
    ("grpc.enable_retries", 1),
    (
        "grpc.service_config",
        json.dumps(
            {
                "methodConfig": [
                    {
                        "name": [{}],
                        "retryPolicy": {
                            "maxAttempts": 5,
                            "initialBackoff": "0.1s",
                            "maxBackoff": "1s",
                            "backoffMultiplier": 2,
                            "retryableStatusCodes": ["UNAVAILABLE"],
                        },
                    }
                ]
            },
        ),
    ),
]

[murgatroid99]

This has been fixed in version 1.9.1.