Pie-models

:books: Documentation

* add deprecation massage to README.md (67) ArneBinder

:rocket: Features

* add `RegexPartitioner`, `RelationArgumentSorter` and `TextSpanTrimmer` (65) ArneBinder

* implement `utils.resolve_type()` (61) ArneBinder

:rocket: Features

* add `SpanLengthCollector` metric (62) ArneBinder
* add `document.processing.tokenization` (60) ArneBinder

* update `pytorch-ie` to 0.29.0 (58) ArneBinder
* improve label handling in RE taskmodule (57) ArneBinder

:beetle: Fixes

* RE inference: do not filter out none-labeled relations if `add_candidate_relation` is disabled (56) ArneBinder

* upgrade `pytorch-ie` to 0.28 and other packages (54) ArneBinder
* decouple from datasets (52) ArneBinder

:construction_worker: Continuous Integration

* add codecov config (53) ArneBinder

* increase `pytorch-ie` version requirement to `>=0.26.0,<0.28.0` (50) ArneBinder