Ensure deletion of Project, Resource, and FileObject

Currently, the delete method on the objects is to quickly called in my opinion. Since, there is no trash bin a single false call could result in a lot of harm. Therefore, I propose to ensure the method a bit by requiring an additional enable parameter to be set to True before giving the call to the Coscine API.

src/coscine/object.py

@@ -331,14 +331,18 @@ class FileObject:
 
 ###############################################################################
 
-	def delete(self) -> None:
+	def delete(self, enable=False) -> None:
 		"""
 		Deletes the file-like object on the Coscine server.
 		"""
 
-		uri = self.client.uri("Blob", "Blob", self.resource.id)
-		args = {"path": self.path}
-		self.client.delete(uri, params = args)
+		if enable:
+			uri = self.client.uri("Blob", "Blob", self.resource.id)
+			args = {"path": self.path}
+			self.client.delete(uri, params = args)
+		else:
+			print(f"Ensure you really want to delete this file object '{self.name}' and rerun with `enable=True`.")
+
 
 ###############################################################################