v1.7.0 - batches

This is a big one! Solid Queue finally supports job batches thanks to @jpcamara . Check the README for more details about how to use these. This took ages despite being a very requested feature 😅 Big thanks to @jpcamara for his patience, refinements and production-app tests! What's Changed Clarify that concurrency + bulk enqueuing is a perf caveat, not unsafe by @Gnirt in #785 Wait for polling queries in logging tests instead of sleeping by @wintan1418 in #775 Keep semaphore slots held while ...