Adapt to ESM notation (for code compatibility with other Dojo projects)

ExpressAPI/src/managers/ExerciseManager.ts

ExpressAPI/src/managers/GitlabManager.ts

ExpressAPI/src/managers/HttpManager.ts

ExpressAPI/src/managers/UserManager.ts

ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts

ExpressAPI/src/middlewares/ParamsCallbackManager.ts

ExpressAPI/src/middlewares/SecurityMiddleware.ts

ExpressAPI/src/middlewares/SessionMiddleware.ts

ExpressAPI/src/process/ClusterManager.ts

ExpressAPI/src/process/ClusterStrategy.ts

ExpressAPI/src/process/WorkerPool.ts

ExpressAPI/src/routes/ApiRoutesManager.ts

ExpressAPI/src/routes/AssignmentRoutes.ts

ExpressAPI/src/routes/BaseRoutes.ts

ExpressAPI/src/routes/ExerciseRoutes.ts

ExpressAPI/src/routes/GitlabRoutes.ts

ExpressAPI/src/routes/SessionRoutes.ts

ExpressAPI/src/shared

ExpressAPI/src/types/DatabaseTypes.ts

ExpressAPI/src/types/express/index.d.ts