This also moves all helper methods in `configure-fastly` into a separate utility file, and adds some additional unit tests for those utilities now that they are separated.
We’ve now exceeded our max number of characters for a condition in the Fastly API, and we need to make it larger to accommodate regex conditionals that can match on any of the routes in www currently.
This fixes the issue by moving the conditions – and the states that are affected by it, like setting the backend or cache ttls – to two custom vcl files that are updated via the Fastly API. One is for the `vcl_rev` config, and one is for the `vcl_fetch` config.
