test(bruno): Add API tests for Kobo, Koreader, OPDS, collections

- Add Kobo bookmark/markup sync tests
- Add Koreader progress/bookmark sync tests
- Add OPDS feed tests
- Add collection tests
- Add sync tests for book linking

bruno/collections/Get Collection.bru

@@ -0,0 +1,14 @@
+meta {
+  name: Get Collection
+  type: http
+  seq: 3
+}
+
+get {
+  url: {{base_url}}/api/collections/{{collection_id}}
+  auth: bearer
+}
+
+auth:bearer {
+  token: {{token}}
+}