Update datasets task tags to align tags with models (#4067)

* update tasks list

* update tags in dataset cards

* more cards updates

* update dataset tags parser

* fix multi-choice-qa

* style

* small improvements in some dataset cards

* allow certain tag fields to be empty

* update vision datasets tags

* use multi-class-image-classification and remove other tags

Commit from https://github.com/huggingface/datasets/commit/edb4411d4e884690b8b328dba4360dbda6b3cbc8

README.md

@@ -18,30 +18,32 @@ task_categories:
   ynat:
   - text-classification
   sts:
-  - text-scoring
+  - text-classification
   nli:
   - text-classification
   ner:
-  - structure-prediction
+  - token-classification
   re:
-  - structure-prediction
+  - token-classification
   dp:
-  - structure-prediction
+  - token-classification
   mrc:
   - question-answering
   wos:
-  - sequence-modeling
+  - text-generation
+  - fill-mask
 task_ids:
   ynat:
   - topic-classification
   sts:
+  - text-scoring
   - semantic-similarity-scoring
   nli:
   - natural-language-inference
   ner:
   - named-entity-recognition
   re:
-  - other-relation-extraction
+  - token-classification-other-relation-extraction
   dp:
   - parsing
   mrc: