Feat: CLI proposal

[JasonHonKL]

Is your feature request related to a problem? Please describe.
I am hoping to run plexe in a more simple way. For example

plexe "the prompt here" --dataset="dataset" --config="config-file" --work-dir="working directory here"

Describe the solution you'd like
This would be quite complex task like there are really quite a lot of subtasks to handle. However I do think really useful

Describe alternatives you've considered
N/A

Additional context
N/A

[JasonHonKL]

@vaibs-d please let me know if this proposal is approved so that I can start working on it !