refactor: bunch of improvements

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/models/JmapServiceObject.ts

@@ -51,5 +51,13 @@ export class JmapServiceObject extends ServiceObject {
   get accountId(): string | undefined {
     return this.jmapAuxiliary.accountId
   }
+
+  get deleteMode(): 'soft' | 'hard' {
+    return this.jmapAuxiliary.deleteMode === 'hard' ? 'hard' : 'soft'
+  }
+
+  get deleteDestination(): string | undefined {
+    return this.jmapAuxiliary.deleteDestination
+  }
   
 }