jobqueue: Introduce jobqueue backed by a postgres database

Co-authored-by: sanne <sanne.raymaekers@gmail.com>

vendor/github.com/jackc/puddle/CHANGELOG.md

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+# 1.1.3 (December 3, 2020)
+
+* Fix: Failed resource creation could cause concurrent Acquire to hang. (Evgeny Vanslov)
+
+# 1.1.2 (September 26, 2020)
+
+* Fix: Resource.Destroy no longer removes itself from the pool before its destructor has completed.
+* Fix: Prevent crash when pool is closed while resource is being created.
+
+# 1.1.1 (April 2, 2020)
+
+* Pool.Close can be safely called multiple times
+* AcquireAllIDle immediately returns nil if pool is closed
+* CreateResource checks if pool is closed before taking any action
+* Fix potential race condition when CreateResource and Close are called concurrently. CreateResource now checks if pool is closed before adding newly created resource to pool.
+
+# 1.1.0 (February 5, 2020)
+
+* Use runtime.nanotime for faster tracking of acquire time and last usage time.
+* Track resource idle time to enable client health check logic. (Patrick Ellul)
+* Add CreateResource to construct a new resource without acquiring it. (Patrick Ellul)
+* Fix deadlock race when acquire is cancelled. (Michael Tharp)