Improve the error message when using the latest tokio-console with the old console-subscriber

[0xPoe]

In 7c1f9f2, we introduced a new API. And use it in the latest tokio-console.

But if users use the latest tokio-console to connect an old server. It will lead to a connection issue.

For now, it will try to reconnect the server again and again. Maybe we should consider handling this kind of error and suggest to users that they should upgrade their console-subscriber.

The error is: error connecting: Status { code: Unimplemented, metadata: MetadataMap { headers: {"date": "Wed, 06 Nov 2024 01:56:10 GMT", "content-type": "application/grpc", "content-length": "0"} }, source: None }