feat(server): custom library scanning interval (#4390)

* add automatic library scan config options

* add validation

* open api

* use CronJob instead of cron-validator

* fix tests

* catch potential error of the library scan initialization

* better description for input field

* move library scan job initialization to server app service

* fix tests

* add comments to all parameters of cronjob contructor

* make scan a child of a more general library object

* open api

* chore: cleanup

* move cronjob handling to job repoistory

* web: select for common cron expressions

* fix open api

* fix tests

* put scanning settings in nested accordion

* fix system config validation

* refactor, tests

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/src/immich/app.service.ts

@@ -1,4 +1,4 @@
-import { JobService, ONE_HOUR, SearchService, ServerInfoService, StorageService } from '@app/domain';
+import { JobService, LibraryService, ONE_HOUR, SearchService, ServerInfoService, StorageService } from '@app/domain';
 import { Injectable, Logger } from '@nestjs/common';
 import { Cron, CronExpression, Interval } from '@nestjs/schedule';
 
@@ -8,6 +8,7 @@ export class AppService {
 
   constructor(
     private jobService: JobService,
+    private libraryService: LibraryService,
     private searchService: SearchService,
     private storageService: StorageService,
     private serverService: ServerInfoService,
@@ -28,6 +29,7 @@ export class AppService {
     await this.searchService.init();
     await this.serverService.handleVersionCheck();
     this.logger.log(`Feature Flags: ${JSON.stringify(await this.serverService.getFeatures(), null, 2)}`);
+    await this.libraryService.init();
   }
 
   async destroy() {