Should we introduce a `osnadmin channel info` subcmd?

### Current Status

osnadmin support following cmds today: join, list and remove.
If we want to get detailed information on specific channel, we use the `list` cmd with specific channel id.
```
List channel information for an Ordering Service Node (OSN). If the channelID flag is set, more detailed information will be provided for that channel.
```

### Expected

Another better option is to let `list` only do list all channels work, and introduce a separate subcmd such as `info` to do the detailed info query on specific channel.

### Solution

Add a new subcmd of `info`.

### Please let us know if you plan to work on this.

Yes!