Enhance API Explorer with Google Analytics

[giteshk]

Using Google Analytics Events you can add visibility to the API Providers on how their API consumers are interacting with the API Documentation.

They can run metrics on
% of Developers who actually use the Try Out.
Which APIs within the API Explorer do they actually interact with.
% of Developers who get 200 responses vs non-200 responses from the Try it Out.

This is all meaningful information that the Site owners can use to improve their API Portal experiences.

[arunz6161]

This change has to be made in upstream- SmartDocs code. Will check with the team.