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

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

* Prettier

src/utils/MultiInviter.ts

@@ -64,7 +64,7 @@ export default class MultiInviter {
      * @param {string} roomId The ID of the room to invite to
      * @param {function} progressCallback optional callback, fired after each invite.
      */
-    constructor(private roomId: string, private readonly progressCallback?: () => void) {
+    public constructor(private roomId: string, private readonly progressCallback?: () => void) {
         this.matrixClient = MatrixClientPeg.get();
     }