add `config` subcommand

[prodanlabs]

Today we discussed kurator internally,the tool subcommand doesn't make much sense. For this function, it's my fault,i didn't think clearly.

By default, the kurator configuration file is embedded in the binary file. If you want to view the configuration, you need to go to the kurator repository to view the configuration file,if you want to modify the configuration file (such as changing the component version), you still need to go to the kurator repository to download the configuration file to the current server, and then modify it. It is inconvenient for users.

So what we need is the config subcommand, not the tool, our idea is

• [ ] kurator tool list changed to kurator config list/show . View version information for all components.
• [ ] Add kurator config gen/dump command to generate default configuration file.

@hzxuzhonghu @zirain What do you think?