feat: Allow Skipping Pip Installation

[mw-root]

Description

This change allows consumers to skip pip installation by setting the install-pip input to false (or really, anything other than true).

This can speed up the action by around 5sec for those who don't need to use pip.

closes #29

[mw-root]

@kishaningithub the way you're doing checkout in your workflows doesn't appear to work on forked repos.

Is there a reason why you provide so many inputs instead of just doing a vanilla checkout with the depth setting aren't using the checkout action?

[kishaningithub]

@mw-root The checkout action does not work within amazon linux 2 container which this action supports