Extract defaultCache into new utils package
- Created a
utilspackage and moved thedefaultCachethere. - Updated imports.
I kept the export of the cache from json-api-client since it made sense. We could also move the defaultCache there, but I like having it in a separate package for those making things with the base client that may want to use this cache, but don't want to install the json-api-client for that one function.