feat(models/schema): Map up posts & threads table

src/schema.rs

@@ -0,0 +1,24 @@
+table! {
+    posts (id) {
+        id -> Int4,
+        thread -> Int4,
+        body -> Text,
+        posted -> Timestamptz,
+    }
+}
+
+table! {
+    threads (id) {
+        id -> Int4,
+        title -> Varchar,
+        body -> Text,
+        posted -> Timestamptz,
+    }
+}
+
+joinable!(posts -> threads (thread));
+
+allow_tables_to_appear_in_same_query!(
+    posts,
+    threads,
+);