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

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

* Prettier

src/BlurhashEncoder.ts

@@ -35,7 +35,7 @@ export class BlurhashEncoder {
     private seq = 0;
     private pendingDeferredMap = new Map<number, IDeferred<string>>();
 
-    constructor() {
+    public constructor() {
         this.worker = new BlurhashWorker();
         this.worker.onmessage = this.onMessage;
     }