[chore] cli clean up / CLI清理

[Fatman13]

• Change to cctx.NArg() instead of cctx.Args().xxx
• Add ArgsUsage to commands that was missing it
• Add check for args and print help on functions that did not have it

关联：

• chore: cli: cleanup cli  lotus#10114

[simlecode]

venus 不需要，其它组件可以做做