Add sequence labelling output

great_ai/views/outputs/sequence_labeling_output.py

@@ -1 +1,15 @@
-# todo
+from typing import Any, List, Literal, Optional
+
+from ..hashable_base_model import HashableBaseModel
+
+
+class LabeledToken(HashableBaseModel):
+    token: str
+    tag: Literal["B", "I", "O", "E", "S"]
+    confidence: float
+    explanation: Optional[Any]
+
+
+class SequenceLabelingOutput(HashableBaseModel):
+    labeled_tokens: List[LabeledToken]
+    explanation: Optional[Any]