add including files that need their requires checked

[tenceleste]

This is a very naive way to approach what I think needs to be done, but it works.

I didn't want to mess with the patterns in the serverless.yml, so I've added another var that can be in package called includeRequires. I've also updated the code I was attempting to deploy to have this variable. https://github.com/Brightspace/discovery-bff/pull/437