feat: Use postgres as a queue

We've been keen to try this for a while as it means we can remove redis as a
dependency, which makes Immich easier to setup and run.

This replaces bullmq with a bespoke postgres queue. Jobs in the queue are
processed either immediately via triggers and notifications, or eventually if a
notification is missed.

e2e/src/api/specs/jobs.e2e-spec.ts

@@ -78,7 +78,7 @@ describe('/jobs', () => {
       }
 
       await utils.jobCommand(admin.accessToken, JobName.MetadataExtraction, {
-        command: JobCommand.Empty,
+        command: JobCommand.Clear,
         force: false,
       });
 
@@ -160,7 +160,7 @@ describe('/jobs', () => {
       expect(assetBefore.thumbhash).toBeNull();
 
       await utils.jobCommand(admin.accessToken, JobName.ThumbnailGeneration, {
-        command: JobCommand.Empty,
+        command: JobCommand.Clear,
         force: false,
       });