Add an accommodations reservations module (#188)

Add a new module to enable accommodations reservation

![](https://gitea.communiquons.org/attachments/de1f5b12-0a93-40f8-b29d-97665daa6fd5)

Reviewed-on: #188

geneit_backend/src/extractors/mod.rs

@@ -1,3 +1,6 @@
+pub mod accommodation_extractor;
+pub mod accommodation_reservation_calendar_extractor;
+pub mod accommodation_reservation_extractor;
 pub mod couple_extractor;
 pub mod family_extractor;
 pub mod member_extractor;