Fast run

Compare the claims to write with the data of the SPARQL endpoint, to skip the writes that change nothing. Import them from wikibaseintegrator.wbi_fastrun.

FastRunContainer	A FastRunContainer loads the statements of the entities matching the base filter from the SPARQL endpoint and caches them, so that a bot can check whether a write is required without loading every entity through the API.
get_fastrun_container	Return a FastRunContainer object, create a new one if it doesn't already exist.