Pytorch-ie

* implement test_step for TransformerSpanClassificationModel and refactor (175) ArneBinder

* dont export core and fix readme examples (173) ArneBinder

* reoarganize pytorch_ie.core (166) ArneBinder
* add nox sessions: tests_no_local_datasets and tests_only_local_datasets (170) ArneBinder
* use Auto classes in readme (165) ArneBinder
* Fix dummy data folder name for NL dataset (168) ChristophAlt
* Add AutoTaskModule, AutoModel, AutoPipeline (157) ChristophAlt
* NER datasets (162) ChristophAlt

* Initial datasets setup (155) ChristophAlt
* Reworked TaskModule and Pipeline (149) ChristophAlt
* Make readme examples work in interactive interpreter (145) ChristophAlt
* Update main dependencies to latest version (141) ChristophAlt
* Drop python 3.8 support (143) ChristophAlt
* Prototype annotations, documents, and dataset (130) ArneBinder

* implement Model.test_step (133) ArneBinder

* Refactor datamodule (121) ArneBinder
* refactor conll2003 (122) ArneBinder
* fix 124 (125) GabrielKP
* add train test for transformer_token_classification (115) ArneBinder

:beetle: Fixes

* exclude spans that are out of valid window (128) ArneBinder