Feature Request: Provide ability to invoke chained functions

Hi,

given that I have a chain of Cmds (update, user, set, name) and "john" being an argument:
```
>>> update user set name john
```

It would be nice to have the invocation of this string as a subsequent invocation of all cmds in the chain. resulting in:
update.Func() -> user.Func() -> set.Func() -> name.Func() -> (c.Args[0] == john)

rather than only the function of `name`

right now I could parse c.RawArgs when name.Func() is called and call each cmds by myself. but it would be nice to have it built in into ishell.