dav: add default implementation for save_resource

crates/carddav/src/address_object/resource.rs

@@ -186,10 +186,6 @@ impl<AS: AddressbookStore + ?Sized> ResourceService for AddressObjectResourceSer
         })
     }
 
-    async fn save_resource(&self, _file: Self::Resource) -> Result<(), Self::Error> {
-        Err(Error::NotImplemented)
-    }
-
     async fn delete_resource(&self, use_trashbin: bool) -> Result<(), Self::Error> {
         self.addr_store
             .delete_object(&self.principal, &self.cal_id, &self.object_id, use_trashbin)

crates/carddav/src/principal/mod.rs

@@ -171,8 +171,4 @@ impl<A: AddressbookStore + ?Sized> ResourceService for PrincipalResourceService<
             })
             .collect())
     }
-
-    async fn save_resource(&self, _file: Self::Resource) -> Result<(), Self::Error> {
-        Err(Error::NotImplemented)
-    }
 }

crates/carddav/src/root/mod.rs

@@ -100,8 +100,4 @@ impl ResourceService for RootResourceService {
     async fn get_resource(&self) -> Result<Self::Resource, Self::Error> {
         Ok(RootResource)
     }
-
-    async fn save_resource(&self, _file: Self::Resource) -> Result<(), Self::Error> {
-        Err(Error::NotImplemented)
-    }
 }