- added earliestPublicationDate for App/Models/Dataset.ts

- new classes TokenWorkerService.ts, TokenWorker.ts and ResumptionToken.ts for using REDIS with paging OAI results
- deletd public/asstes2/langCodeMap.xml: integrated it directly in datasetxml2oai-pmh.xslt
- added redis npm package
- added TokenWorkerProvider.ts for using singleton of TokenWorkerService inside OaiController.ts
- added config/oai.ts for oai related configs from .env-file
- adapted XmlModel.ts for grting domDocument from database

config/oai.ts

@@ -0,0 +1,18 @@
+import Env from '@ioc:Adonis/Core/Env';
+
+interface OaiConfig {
+    max: { listidentifiers: number; listrecords: number };
+    workspacePath: string;
+    redis: { ttl: number };
+}
+const config: OaiConfig = {
+    max: {
+        listidentifiers: parseInt(Env.get('OAI_LIST_SIZE', 100), 10),
+        listrecords: parseInt(Env.get('OAI_LIST_SIZE', 100), 10),
+    },
+    workspacePath: 'workspace',
+    redis: {
+        ttl: 86400, //sec 1 day
+    },
+};
+export default config;