There is no need to test linting separately, because this is done in pytest run since:
#74

Remove seperate linting step in github actions

Remove the `TaskProgressModel` and store progress information directly into `TaskModel`.
The existing TaskProgressModel progress information will be migrated into `TaskModel` ;)

Also store the current progress count into `SignalInfoModel` instance: So it is stored at which
progress the signal was generated.

Add `TaskModel.cumulate_progress` field that indicates if progress of the sub tasks be added up and
saved in the parent task.

Add `TaskModel.finished` field that indicates that this Task no longer waits or run.

Idea comes from:
#57 (comment)

Remove TaskProgressModel and store progress in TaskModel.progress_count

update requirements

Release