Changes to endpoints so they allow to only get context and then the exercises as well as tidying up a bit

app/dtos/level.py

@@ -0,0 +1,19 @@
+from typing import List, Optional
+
+from pydantic import BaseModel
+
+from app.configs.constants import LevelExerciseType
+
+
+class LevelExercises(BaseModel):
+    type: LevelExerciseType
+    quantity: int
+    text_size: Optional[int]
+    sa_qty: Optional[int]
+    mc_qty: Optional[int]
+    topic: Optional[str]
+
+class LevelExercisesDTO(BaseModel):
+    text: str
+    exercises: List[LevelExercises]
+    difficulty: Optional[str]