Pytorch-ie

* upgrade github workflow constraints (327) ArneBinder

:rocket: Features

* add model and taskmodule Interface classes (328) ArneBinder

* set minimum transformers version (325) ArneBinder
* update `datasets` and `transformers` (323) ArneBinder
* Update `pytorch-lightning` (322) ArneBinder
* update (dev) dependencies (321) ArneBinder

:beetle: Fixes

* set minimum `datasets` version (324) ArneBinder

* integrate eval_counts_for_layer() into F1Metric.calculate_counts() (318) ArneBinder

:rocket: Features

* tokenize_document: set text_pair if text is already provided (317) ArneBinder
* conversion of text based document to token based and tokenize document (315) ArneBinder

:beetle: Fixes

* fix statistic value aggregation for empty result lists (316) ArneBinder

:rocket: Features

* aggregate the result of DocumentStatistic (313) ArneBinder
* implement DocumentStatistics (312) ArneBinder

:beetle: Fixes

* Fix Document.add_all_annotations_from_other() (310) ArneBinder