Pie-modules

:beetle: Fixes

* Exclude none class for metrics (47) ArneBinder

:beetle: Fixes

* fix `tokenize_document()`: check only for missing annotations in layers that are in the `result_document_type` (51) ArneBinder

:beetle: Fixes

* convert values to `LongTensor` in `MetricWithArbitraryCounts.get_counts()` (49) ArneBinder

:beetle: Fixes

* make instantiated models picklable (46) ArneBinder
* Fix state of wrapped layer metrics with unbatch and decode with errors function (45) ArneBinder
* fix logging nested metric dicts (44) ArneBinder

* remove `WrappedMetricWithUnbatchFunction` (41) ArneBinder

:boom: Breaking Changes

* Fix and streamline sequence classification (39) ArneBinder
* streamline `SimpleGenerativeModel` (37) ArneBinder
* refactor token classification (35) ArneBinder

:rocket: Features

* labeled span extraction: add scores for predicted spans (40) ArneBinder

:beetle: Fixes

* Fix and streamline sequence classification (39) ArneBinder
* skip overlapping spans instead of skipping whole documents (33) ArneBinder

:hammer: Refactoring

* Fix and streamline sequence classification (39) ArneBinder
* streamline `SimpleGenerativeModel` (37) ArneBinder
* refactor token classification (35) ArneBinder

* new task: text-2-text (24) ArneBinder
* tokenization: don't regard missed partitions (22) ArneBinder

:boom: Breaking Changes

* new task: pointer network for joint ner and re (10) ArneBinder

:rocket: Features

* add `BartModelWithDecoderPositionIds` base model (26) ArneBinder
* re-arrange and add taskmodule metrics (25) ArneBinder
* add token document types (21) ArneBinder

:beetle: Fixes

* post PR26 fixes (27) ArneBinder