New endpoint to send a list of job ids to a queue.

The task will be picked up by the FTP app. Given the list of job ids the tasks will get all the files from s3, aggregate them then send to dvla

app/letters/letter_schemas.py

@@ -0,0 +1,15 @@
+from app.schema_validation.definitions import uuid
+
+letter_job_ids = {
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "description": "list of job ids",
+    "type": "object",
+    "title": "job_ids",
+    "properties": {
+        "job_ids": {"type": "array",
+                    "items": uuid,
+                    "minItems": 1
+                    },
+    },
+    "required": ["job_ids"]
+}