Add `check` command to check the status of the target host

## Background

For some scenarios, we want to know some basic information about the target host:

- CPU
- Memory
- Disk(maybe can use `fio`)
- Network

When the `check` command is finished, we can get the basic report of the target host.

btw: I'm unsure whether we should include the `check` command in the `cluster` subsystem or create a separate subsystem named `diagnose`.