Add sorting to all data types

- Add name-based sorting for entities with names
- Add order-based sorting for ordered stops
- Add "seconds remaining" based sorting for ETAs
- Add tests to check sorting

src/resolvers/QueryResolvers.ts

@@ -7,12 +7,15 @@ const GRAPHQL_SCHEMA_CURRENT_VERSION = 1;
 export const QueryResolvers: Resolvers<ServerContext> = {
   Query: {
     systems: async (_parent, args, contextValue, _info) => {
-      return contextValue.systems.map((system) => {
-        return {
-          name: system.name,
-          id: system.id,
-        };
-      })
+      return contextValue.systems
+        .slice()
+        .sort((a, b) => a.name.localeCompare(b.name))
+        .map((system) => {
+          return {
+            name: system.name,
+            id: system.id,
+          };
+        })
     },
     system: async (_parent, args, contextValue, _info) => {
       if (!args.id) return null;