Enable @typescript-eslint/explicit-member-accessibility on /src (#9785)

* Enable `@typescript-eslint/explicit-member-accessibility` on /src

* Prettier

src/BasePlatform.ts

@@ -69,7 +69,7 @@ export default abstract class BasePlatform {
     protected notificationCount = 0;
     protected errorDidOccur = false;
 
-    constructor() {
+    public constructor() {
         dis.register(this.onAction);
         this.startUpdateCheck = this.startUpdateCheck.bind(this);
     }