Feat: add gets and delete api paths for students

backend/repository/student_sqlite_repository.py

@@ -77,12 +77,29 @@ class StudentSQLiteRepository(AbstractRepository):
         rows = cursor.fetchall()
         return [self._rebuild_student(r, tribes) for r in rows]
 
-    def delete(self, student: Student) -> None:
+    def list_id(self):
+        cursor = self.conn.cursor()
+        cursor.execute(
+            """
+        SELECT id FROM students
+        """
+        )
+
+        rows = cursor.fetchall()
+        return [r[0] for r in rows]
+
+    def delete(self, id: str) -> None:
+        students_id = self.list_id()
+        if id not in students_id:
+            raise StudentRepositoryError(
+                f"The student {id} doesn't exists. Can't delete it."
+            )
+
         self.conn.execute(
             """
             DELETE FROM students WHERE id=:id
             """,
             {
-                "id": student.id,
+                "id": id,
             },
         )