Take model as argument to generate the card

[merveenoyan]

About this comment in this PR. Currently model card generation takes an argument called model which actually is a model path. We need to take model as well as model path, we can warn the user if both of them are missing.

[adrinjalali]

I don't think we need to change anything about the args, the model arg can take an estimator instance, or a path.

[p-mishra1]

@merveenoyan I created a PR regarding this #174 .

[BenjaminBossan]

Solved via #205