BREAKING CHANGE(decorators): Migrate to TC39 standard decorators (accessor) across components, update tsconfig and bump dependencies

ts_web/elements/dees-appui-maincontent.ts

@@ -35,12 +35,12 @@ export class DeesAppuiMaincontent extends DeesElement {
   @property({
     type: Array,
   })
-  public tabs: interfaces.ITab[] = [
+  accessor tabs: interfaces.ITab[] = [
     { key: '⚠️ Please set tabs', action: () => console.warn('No tabs configured for maincontent') },
   ];
 
   @property({ type: Object })
-  public selectedTab: interfaces.ITab | null = null;
+  accessor selectedTab: interfaces.ITab | null = null;
 
   public static styles = [
     cssManager.defaultStyles,