[feature] persist worker queues to db (#3042)

* persist queued worker tasks to database on shutdown, fill worker queues from database on startup

* ensure the tasks are sorted by creation time before pushing them

* add migration to insert WorkerTask{} into database, add test for worker task persistence

* add test for recovering worker queues from database

* quick tweak

* whoops we ended up with double cleaner job scheduling

* insert each task separately, because bun is throwing some reflection error??

* add specific checking of cancelled worker contexts

* add http request signing to deliveries recovered from database

* add test for outgoing public key ID being correctly set on delivery

* replace select with Queue.PopCtx()

* get rid of loop now we don't use it

* remove field now we don't use it

* ensure that signing func is set

* header values weren't being copied over 🤦

* use ptr for httpclient.Request in delivery

* move worker queue filling to later in server init process

* fix rebase issues

* make logging less shouty

* use slices.Delete() instead of copying / reslicing

* have database return tasks in ascending order instead of sorting them

* add a 1 minute timeout to persisting worker queues

internal/messages/messages.go

@@ -352,7 +352,7 @@ func resolveAPObject(data map[string]interface{}) (interface{}, error) {
 // we then need to wrangle back into the original type. So we also store the type name
 // and use this to determine the appropriate Go structure type to unmarshal into to.
 func resolveGTSModel(typ string, data []byte) (interface{}, error) {
-	if typ == "" && data == nil {
+	if typ == "" {
 		// No data given.
 		return nil, nil
 	}