Add an AI supported interactive mode

Since lium covers so many features and hard to sort the command/subcommand, it is helpful if it has an AI suggested or supported interactive mode. In this mode, user can ask lium how to do something in natural language.

```
$ lium bard
> what DUTs I have?
(lium): here are your DUTs
lazor_ABCDEFG ...
kaisa_ABCD123 ...
> I want to flash the latest test image on my lazor DUT.
(lium): I do flash the latest (R123-45678.0.0) test image on lazor_ABCDEFG
...
> Oh, I want to update the firmware on that DUT
(lium): I update the firmware on lazor_ABCDEFG
...
```