feat: add logging to pgPubsub (#11953)

Should be helpful for #11950

Adds a logger to pgPubsub and logs various events, most especially connection and disconnection from postgres.

cli/server.go

@@ -673,7 +673,7 @@ func (r *RootCmd) Server(newAPI func(context.Context, *coderd.Options) (*coderd.
 				}()
 
 				options.Database = database.New(sqlDB)
-				options.Pubsub, err = pubsub.New(ctx, sqlDB, dbURL)
+				options.Pubsub, err = pubsub.New(ctx, logger.Named("pubsub"), sqlDB, dbURL)
 				if err != nil {
 					return xerrors.Errorf("create pubsub: %w", err)
 				}