List all the tasks in the application. You can specify a date range and whether or not you want to include deleted tasks.
The function prints Total number of tasks and No. of Finished Tasks.
A data frame with the following columns: id (task id), registrationTime, statusChangeTime, status
(Submitted, Queued, InProgress, Completed, ProcessingFailed, Deleted, NotEnoughCredits), filesCount (No. of files),
credits, resultUrl (URL for the processed file)).