feat(appdata): Add support for overwriting keys using the overwriteObject option in AppData

ts/npmextra.classes.appdata.ts

@@ -15,6 +15,7 @@ export interface IAppDataOptions<T = any> {
    * kvStoreKey: 'MY_ENV_VAR'
    */
   envMapping?: plugins.tsclass.typeFest.PartialDeep<T>;
+  overwriteObject?: plugins.tsclass.typeFest.PartialDeep<T>;
 }
 
 export class AppData<T = any> {
@@ -175,6 +176,11 @@ export class AppData<T = any> {
       for (const key in this.options.envMapping) {
         await processEnvMapping(key as keyof T, this.options.envMapping[key]);
       }
+
+      for (const key in Object.keys(this.options.overwriteObject)) {
+        console.log(`-> heads up: overwriting key ${key} from options.overwriteObject`);
+        await this.kvStore.writeKey(key as keyof T, this.options.overwriteObject[key]);
+      }
     }
 
     this.readyDeferred.resolve();