CLI => Change commands folder structure

NodeApp/src/commander/assignment/AssignmentCommand.ts

...mmander/assignment/subcommands/AssignmentCreateCommand.ts

...mander/assignment/subcommands/AssignmentPublishCommand.ts

...ment/subcommands/AssignmentPublishUnpublishCommandBase.ts

...nder/assignment/subcommands/AssignmentUnpublishCommand.ts

NodeApp/src/commander/exercise/ExerciseCommand.ts

...c/commander/exercise/subcommands/ExerciseCreateCommand.ts

.../src/commander/exercise/subcommands/ExerciseRunCommand.ts

NodeApp/src/commander/session/SessionCommand.ts

...pp/src/commander/session/subcommands/SessionAppCommand.ts

...src/commander/session/subcommands/SessionGitlabCommand.ts

...p/src/commander/session/subcommands/SessionTestCommand.ts

...session/subcommands/application/SessionAppLoginCommand.ts

...ession/subcommands/application/SessionAppLogoutCommand.ts

...r/session/subcommands/gitlab/SessionGitlabLoginCommand.ts

.../session/subcommands/gitlab/SessionGitlabLogoutCommand.ts