Add Unify Support (#12921)

* unify integration with llama index

* adding docs

* updating notebook

* formatting fixes in notebook

* improve examples

* formatting fix

* reducing verbosity

* adding live benchmark link

* notebook edits

* formatting fix

* Update unify.ipynb

small changes to the text

* bigger fonts

* tweaking font size in unify notebook

* minor unify nb edit

* add dependencies

* add notebook to index

* changes to notebook

* change docs after refactor

* add test

* format + lint

* add poetry lock

* improve readme

* Fix linting issues

* Fix CI errors

* fix linting errors

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Co-authored-by: Aparajith Raghuvir <aparajithr21@gmail.com>
Co-authored-by: aparajith21 <58738384+aparajith21@users.noreply.github.com>
Co-authored-by: guillesanbri <guillesanbri@hotmail.com>
Co-authored-by: Anwaar Khalid <shahanwaar.khalid8@gmail.com>