Pie-datasets

* use `pie-modules` (73) ArneBinder

* fix requirements for dataset scripts (71) ArneBinder
* add `aae2` data files (66) ArneBinder

:boom: Breaking Changes

* import `pie-models` instead of `pytorch-ie` (70) ArneBinder

:tada: New Dataset

* Add AM dataset SciDTB_Argmin (54) idalr

:boom: Breaking Changes

* add generic document processors: `Caster`, `Converter`, `Pipeline` (59) ArneBinder
* make `BratBuilder` re-usable (57) ArneBinder

:rocket: Features

* add document processor: `RelationArgumentSorter` (60) ArneBinder
* add generic document processors: `Caster`, `Converter`, `Pipeline` (59) ArneBinder
* `document_converters` as property of `PieDatasetBuilder` (58) ArneBinder
* make `BratBuilder` re-usable (57) ArneBinder

:beetle: Fixes

* fix `pie-datasets` version ranges in dataset loading scripts (62) ArneBinder

:books: Documentation

* improve documentation (46) ArneBinder

* udpate `pytorch-ie` to 0.29.0 (49) ArneBinder
* simplify `tacred` dataset script (48) ArneBinder
* implement `load_dataset` (47) ArneBinder

:tada: New Dataset

* Add AM dataset - CDCP (15) idalr

:rocket: Features

* add `BASE_DATASET_REVISION` and `BASE_DATASET_REVISIONS` to the dataset builder (44) ArneBinder

:books: Documentation

* add usage documentation from `pytorch-ie` README.md (45) ArneBinder

* make BRAT document types exportable (41) ArneBinder
* add `requirements.txt` files to dataset scripts (40) ArneBinder

* upgrade `pytorch-ie` to 0.28 (38) ArneBinder
* create core package (37) ArneBinder
* remove some statistics (35) ArneBinder
* add statistics (29) ArneBinder
* integrate `Dataset` related classes from PyTorch-IE (21) ArneBinder

:tada: New Dataset

* add generic `brat` dataset (12) ArneBinder

:beetle: Fixes

* remove leftovers from datasets in pytorch-ie (31) ArneBinder

:construction_worker: Continuous Integration

* do not assert minimum test coverage via pytest (30) ArneBinder