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/Cargo.toml

@@ -10,6 +10,7 @@ log = "0.4.21"
 env_logger = "0.11.3"
 clap = { version = "4.5.4", features = ["derive", "env"] }
 lazy_static = "1.4.0"
+lazy-regex = "3.1.0"
 anyhow = "1.0.83"
 actix-web = "4.5.1"
 actix-cors = "0.7.0"
@@ -38,3 +39,5 @@ zip = "2.0.0"
 mime_guess = "2.0.4"
 tempfile = "3.10.1"
 base64 = "0.22.0"
+ical = { version = "0.11.0", features = ["generator", "ical", "vcard"] }
+chrono = "0.4.38"