Move project to ESM only

ExerciseChecker/.idea/jetbrainsConfiguration

ExerciseChecker/package-lock.json

ExerciseChecker/package.json

ExerciseChecker/src/app.ts

ExerciseChecker/src/init.ts

ExerciseChecker/src/managers/DojoBackendManager.ts

ExerciseChecker/src/managers/GitlabManager.ts

ExerciseChecker/src/managers/HttpManager.ts

ExerciseChecker/src/shared

ExerciseChecker/src/sharedByClients

ExerciseChecker/tsconfig.json