[Experiment] New object-oriented grammar for distkv cli

[jovany-wang]

I'd like to propose a new grammar for distkv, and the new grammar looks like a object-oriented command set:

> li = list("v1", "v2", "v3")
> ok
> li.lput("v0")
> ok
> print li
> LIST with 4 items: ["v0", "v1", "v2", "v3"]

[jovany-wang]

@tortuo @kairbon @meijies @senyer

[kairbon]

This grammar looks good and can be used as a new grammar standard. If we have the idea of expanding this project into distributed computing in the future, I think this syntax is very helpful.