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>

cli/src/api/open-api/api.ts

@@ -3283,6 +3283,12 @@ export interface SystemConfigDto {
      * @memberof SystemConfigDto
      */
     'job': SystemConfigJobDto;
+    /**
+     * 
+     * @type {SystemConfigLibraryDto}
+     * @memberof SystemConfigDto
+     */
+    'library': SystemConfigLibraryDto;
     /**
      * 
      * @type {SystemConfigMachineLearningDto}
@@ -3534,6 +3540,38 @@ export interface SystemConfigJobDto {
      */
     'videoConversion': JobSettingsDto;
 }
+/**
+ * 
+ * @export
+ * @interface SystemConfigLibraryDto
+ */
+export interface SystemConfigLibraryDto {
+    /**
+     * 
+     * @type {SystemConfigLibraryScanDto}
+     * @memberof SystemConfigLibraryDto
+     */
+    'scan': SystemConfigLibraryScanDto;
+}
+/**
+ * 
+ * @export
+ * @interface SystemConfigLibraryScanDto
+ */
+export interface SystemConfigLibraryScanDto {
+    /**
+     * 
+     * @type {string}
+     * @memberof SystemConfigLibraryScanDto
+     */
+    'cronExpression': string;
+    /**
+     * 
+     * @type {boolean}
+     * @memberof SystemConfigLibraryScanDto
+     */
+    'enabled': boolean;
+}
 /**
  * 
  * @export