feat(library): add IGDB editions, game links and auditor queue

Tables game_edition (IGDB "same game" id per library key), game_link
(global sets set by auditors), game_link_pair (queue of IGDB and
requested pairs), game_link_request and account_name. Fetch IGDB
editions, link and unlink with audit rows, serve the paged auditor queue
with request counts. WireMock recordings for the editions query.

local/wiremock/mappings/igdb-editions.json

@@ -0,0 +1,18 @@
+{
+  "request": {
+    "method": "POST",
+    "urlPath": "/igdb/games",
+    "bodyPatterns": [
+      {
+        "contains": "fields version_parent"
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "headers": {
+      "Content-Type": "application/json"
+    },
+    "bodyFileName": "igdb-editions.json"
+  }
+}