refactor: change controller visibility to private in OCRModules

Author: NorbertKlockiewicz

packages/react-native-executorch/src/modules/computer_vision/OCRModule.ts

@@ -7,7 +7,7 @@ import { OCRDetection, OCRLanguage } from '../../types/ocr';
  * @category Typescript API
  */
 export class OCRModule {
-  public controller: OCRController;
+  private controller: OCRController;
 
   constructor() {
     this.controller = new OCRController();

packages/react-native-executorch/src/modules/computer_vision/VerticalOCRModule.ts

@@ -8,7 +8,7 @@ import { ResourceSource } from '../../types/common';
  * @category Typescript API
  */
 export class VerticalOCRModule {
-  public controller: VerticalOCRController;
+  private controller: VerticalOCRController;
 
   constructor() {
     this.controller = new VerticalOCRController();