Add operation scraper

[evanchooly]

I would like a scraper that, given a set of urls, can extract all the operators in a certain context and catalog them. Using this catalog, I can track missing operations in the morphia API once combined with some internal auditing as well.

This internal auditing can perhaps use the @mongodb.driver.manual taglets to link up methods with operations in this catalog. Or perhaps a new non-retained annotation can be used instead.