5- Feat/read expected nb of images

• read expected number of images from input csv
• add images in dataset class
• check nb of read images

rlt_migration/models/dataset.py

 #! python3  # noqa: E265
 
 
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum
 
-from rlt_migration.models.image import SupportEnum
+from rlt_migration.models.image import Image, SupportEnum
 
 
 class CouleurEnum(Enum):
@@ -23,3 +23,6 @@ class Dataset:
     support: SupportEnum = SupportEnum.NON_DEFINI
     oblique: bool | None = None
     couleur: CouleurEnum = CouleurEnum.NON_DEFINI
+
+    expected_image_number: int | None = None
+    images: [Image] = field(default_factory=lambda: [])