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.

server/src/services/metadata.service.spec.ts

@@ -67,16 +67,12 @@ describe(MetadataService.name, () => {
   });
 
   describe('onBootstrapEvent', () => {
-    it('should pause and resume queue during init', async () => {
-      mocks.job.pause.mockResolvedValue();
+    it('should init', async () => {
       mocks.map.init.mockResolvedValue();
-      mocks.job.resume.mockResolvedValue();
 
       await sut.onBootstrap();
 
-      expect(mocks.job.pause).toHaveBeenCalledTimes(1);
       expect(mocks.map.init).toHaveBeenCalledTimes(1);
-      expect(mocks.job.resume).toHaveBeenCalledTimes(1);
     });
   });