[Analyzer] Add model explainability

[lalitpagaria]

Adding support for model explainability with transformer models. It should be provided via optional dependencies along with optional parameter. Following repos can be used -

https://github.com/hila-chefer/Transformer-Explainability
https://github.com/cdpierse/transformers-interpret

[Bonus work :D ] For non transformer model
https://github.com/marcotcr/lime

[shahrukhx01]

@lalitpagaria I'll take up this once #75 is closed.

[lalitpagaria]

@shahrukhx01 Let's wait for this -
cdpierse/transformers-interpret#48 (reply in thread)